Overview
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Thanks to its great typing and solid defenses, Vileplume shines as one of the finest defensive and offensive pivots in the tier. It's Vileplume's Its (less repetitive and it's obvious it's about Vileplume) typing gives it invaluable resistances to Electric-, Ground-(add hyphen), Grass-, Water-, and most importantly, (AC) (or put 'most importantly in its entirety between commas as an appositive, but not like this) Fighting-type moves, while providing it with an immunity to powder moves, Leech Seed, and Toxic. This typing is a bit of a double-edged sword; (SC) (should be a comma) however, as it gives it a weakness to the very common Psychic- and Fire-types in the tier. Access to reliable recovery options in both Giga Drain and Moonlight (It sounded like you were calling Giga Drain reliable before) further enhances its durability and ability to handle many offensive Pokemon. Effect Spore is also a great ability, potentially leaving you with an advantage and even sometimes winning you the game. Unlike some other defensively-inclined Pokemon, it Vileplume also has a great Special Attack stat that allows it to hit hard even uninvested without investment (RC) and even viably run an offensive set. Unfortunately, only solid defenses means very strong attackers can break through it, and its low Speed guarantees means (you can't guarantee something and then say its rare for it to not happen)it will rarely be moving first. Depending on its last moveslot, it Vileplume can also be a free switch-in to Poison- and Steel-types such as Ferroseed and Garbodor Garbodor and Ferroseed (changed to match list order), which can set up entry hazards all over it. Vileplume's qualities strengths largely outweigh its flaws weaknesses (flaws are still technically qualities, so I tweaked this a bit), (yeah but you already solved that with qualities -> strengths, so this one was unnecessary, the original is fine), (AC) however, making it one of the most popular choices in for balanced and bulky offense offensive teams, (AC) while still fitting in almost any playstyle.
Defensive
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name: Defensive
move 1: Giga Drain
move 2: Moonlight
move 3: Sludge Bomb
move 4: Sleep Powder / Aromatherapy
ability: Effect Spore
item: Black Sludge
evs: 248 HP / (add space here too) 252 Def (Add Space)/ 8 SpD
nature: Bold
Moves
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Giga Drain is a decently strong STAB move (remember that STAB means same type attack bonus, so if saying that expanded doesnt make sense you usually need a noun like "move" or "option" afterwards) that lets it Vileplume heal back restore some health HP. Moonlight provides Vileplume with reliable recovery, allowing it to heal itself when it's damaged and come in more repeatedly easily throughout the match. Sludge Bomb is its Vileplume's strongest STAB move and it has a nifty 30% chance to poison the foe, which when paired with Effect Spore, (AC) gives it Vileplume (if you're referring to sludge bomb here, keep it. but i assume you mean vileplume as a whole) a high chance to cripple the opponent foe. Vileplume has a versitile several ('versatile options' makes no sense) options for its fourth moveslot, (AC) to which that can cripple some of its checks and counters. Sleep Powder puts common switch-ins like such as Garbodor and (you didn't finish the list, lol)to sleep, letting you Vileplume fearlessly switch out to something else a teammate, which can and generate free turns. Aromatherapy works best in on more defensively-oriented teams, (AC) by giving them a cleric and also healing any of Vileplume's its own status afflictions. Moonblast is an option to that threatens Malamar trying to set up on you, 3HKOing it with some SpA Special Attack investment (RC) while also hitting the Fighting- and Dark-types it Vileplume checks harder. Hidden Power Fire can be used to hit Steel-types that resist resistant to both its Vileplume's STABs moves, 2HKOing Pawniard, Mawile, and Ferroseed, (AC) while also and 3HKOing Klinklang, all of which these Pokemon can would otherwise be able to set up on you Vileplume or lay entry hazards.
Set Details
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The given EVs and a Bold nature maximize physical bulk. Black Sludge gives Vileplume passive recovery, making it even harder to wear down. Effect Spore lets you Vileplume potentially status an opponent, usually giving you Vileplume a better match-up. 96 SpD Special Defense EVs with a Calm nature can be used to survive +2 Life Orb Lilligant's Hidden Power Fire or Ice. (Period) which can Lilligant would otherwise be able to Quiver Dance set up as you Vileplume comes in, do it again as you Vileplume Sludge Bombs, losing around half of its health, KO you Vileplume, and then even proceed to sweep your team(this was difficult, lol. I tried to keep what you were saying as best I could while keeping verb and subject agreement throughout).
use this: 96 Special Defense EVs with a Calm nature can be used to survive +2 Life Orb-boosted Hidden Power Fire or Ice from Lilligant, which would otherwise be able to set up twice and KO Vileplume as it comes in and uses Sludge Bomb, even proceeding to sweep your team.
Similarly, you (you're not comparing this to anything you are, to the already mentioned SpD investment)Vileplume can run a fully specially defensive set to better wall Water-, Grass-, and Electric-types; (SC) however, this greatly detracts from its physical bulk, meaning you will need a better check for Fighting-types and the like. If you run opt for (Vileplume runs Moonblast, not you) Moonblast, even minimal SpA Special Attack investment gives you Vileplume a higher chance to 3HKO it Malamar, with 88 specifically being needed to always do so. (I assume you're talking about Malamar because you mention Moonblast, but if you're not then this makes no sense, lol.)
Usage Tips
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Vileplume should come in on the numerous important hits it resists or on relatively weak attacks while being careful around super effective coverage moves, such as Sawk's Ice Punch or Zen Headbutt and offensive Lanturn's Ice Beam, or other and variants of Pokemon it checks, such as special Cacturne. Thanks to its typing, it Vileplume can also freely switch into status moves such as Sleep Powder and Toxic, while not minding getting burned or paralyzed burn or paralysis too much, especially if it's running Aromatherapy, which makes it a great pivot into defensive and support Pokemon. Take advantage of switches to heal back HP with Moonlight if it Vileplume has taken significant damage, (AC) as a weakened Vileplume does a poor job of checking what it's supposed to; (SC) however, do so conservatively, (AC) as Moonlight has low PP. but do so conservatively due to its low 8 PP. Both of its Vileplume's STAB moves are very spammable, with Sludge Bomb in particular having has good power and a high chance to poison the foe. You Vileplume can also use Sleep Powder on switch-ins that looking to take advantage of it, (AC) to set up, (AC) or to lay entry hazards, such as Mega Camerupt and Garbodor. While rare, be wary of Sap Sipper Pokemon like such as Bouffalant by not spamming Giga Drain or Sleep Powder, (AC) as you don't want to give them the Attack boost. If running Hidden Power Fire, try catching Steel-types on the switch to prevent them from doing too much against you Vileplume.
Team Options
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Fire- and Ice-type resists Pokemon that resist Fire and Ice partner excellently with Vileplume, namely Water-types like such as Seismitoad, Mantine, Samurott, SpD specially defensive Quagsire, and Lanturn, although Ice-types with access to Freeze-Dry (add hyphen) like such as Cryogonal and Articuno give this core trouble. Hariyama especially has especially fantastic synergy with it Vileplume, resisting the aforementioned types, (AC) while also checking most special attackers in general. Flash Fire Pokemon like such as Typhosion, Ninetales, Lampent, and Flareon all also have great defensive synergy with Vileplume, stopping Fire- and Ice-types in their tracks as Vileplume checks or counters the Water- and Rock-types that give them trouble. Psychic- and Flying-resists are equally important, with Steel-types like such as Klinklang and Ferroseed having solid synergy with it Vileplume. In return, Vileplume beating Water- and Ground-types and even weakening Steel-types with Hidden Power Fire can pave the way to a for a Klinklang sweep. Dark-types like such as Pawniard, Sneasel, and Vullaby check most Psychic-types and appreciate Vileplume checking Fighting- and Fairy-types. Eviolite Zweilous gets a special mention for its additional ability to check or counter Fire-types, too. Spinners and defoggers like Prinplup, Mantine, and Cryogonal such as Cryogonal, Prinplup, and Mantine are important partners as because entry hazards can turn a lot of 3HKOs into 2HKOes and 2HKOes into OHKOs. For example, Life Orb Lilligant's Hidden Power Fire 2HKOs after Stealth Rocks and Ludicolo's Ice Beam has a chance to OHKO after Stealth Rocks and a layer of Spikes. Xatu also works as a method of hazard control, providesing a secondary check to Fighting-types and Lilligant (RC) and prevents while preventing Pokemon like such as Garbodor and Ferroseed from taking advantage of Vileplume by bouncing back their entry hazards.
Offensive
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name: Offensive
move 1: Giga Drain
move 2: Sludge Bomb
move 3: Hidden Power Fire / Sleep Powder
move 4: Moonlight
ability: Effect Spore
item: Black Sludge / Life Orb
evs: 116 HP / 252 SpA / 144 Spe (fixed spacing and spelling)
nature: Modest
Moves
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Giga Drain is a reliable Grass STAB that heals back some health HP, adding to its Vileplume's durability and canceling out Life Orb recoil. Sludge Bomb is Vileplume's strongest STAB move, hitting hard while potentially poisoning the opponent. Hidden Power Fire gives it Vileplume near (remove hyphen) (keep hyphen) perfect coverage, which is only resisted by Lampent, and hits Steel-types like such as Ferroseed, Mawile, Pawniard, (AC) and Klinklang, OHKOing the former first (nothing wrong with former) three if it's Vileplume is holding a Life Orb. Moonlight provides reliable recovery and is one of the main reasons why this set can trouble defensively-oriented teams, as it makes it Vileplume much harder to wear down and lets it check things even with little bulk defensive investment. Sleep Powder puts switch-ins like such as Garbodor and Mega Camerupt to sleep and gives you Vileplume free turns, which can even be used to set up with another Pokemon. Moonblast can be used to 3HKO Malamar trying trying to set up on you, 2HKOing after Stealth Rock, (AC) or if you're Vileplume is holding a Life Orb; (SC) however, Life Orb already lets you Vileplume 3HKO it Malamar with Sludge Bomb already, while having also giving Vileplume a high chance to do so with Giga Drain, so it's not as important. It Moonblast also hits the Fighting- and Dark-types it Vileplume checks harder than its other moves.
Set Details
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252 SpA Special Attack EVs and a Modest nature make it Vileplume extremely powerful, 2HKOing a lot of the metagame. The Speed EVs let it allow Vileplume to make up for Hidden Power Fire's imperfect Speed IVs and outspeed uninvested Lanturn. (period) and The rest remaining EVs is are put into HP to make it Vileplume as bulky as possible. You Vileplume can invest more into HP if Lanturn isn't a concern. Alternatively, you Vileplume can run even more Speed to outrun the likes of Claydol, Malamar, and Seismitoad. Effect Spore is Vileplume's best ability, having a fairly high chance to status the foe on contact. Black Sludge gives it Vileplume more longetivity, while Life Orb increases its power significantly at the cost of recoil damage.
Usage Tips
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This set works best as a pivot for offensive teams, being immune to Toxic, powder moves and Leech Seed switching in on resisted hits and weak walls, such as Ferroseed and Mega Audino without Fire Blast or Psychic becomes much easier, while being immune to Toxic, powder moves, (AC) and Leech Seed. (not sure what you're doing here, the original is fine apart from the missing serial comma) Switch into Fighting- and Grass-types such as Hariyama and Leafeon, but avoid very strong attackers such as Choice Band Sawk, (AC) as they can 2HKO you Vileplume with even even with resisted hits due to the Vileplume's its lack of defensive investment. Generally, your Vileplume's best option is to spam Sludge Bomb against most switch-ins to capitalize on its power and poison chance, which go a long way to weakening the opposing team. Use Hidden Power Fire if you're predicting the opponent to go out to a Steel-type like such as Mawile or Pawniard, as they will usually outspeed you Vileplume and severely dent you it with their STABs moves. If running Sleep Powder, use it as the foe opponent (foe refers to the pokemon, opponent the trainer)goes out to its their Vileplume answer, which gives you at least one free turn to do whatever you want. Stay relatively high on health HP by healing with Moonlight if there's anything on the opposing team you need Vileplume to check.
Team Options
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Hariyama is again, (AC) (no cross-set referencing) a great partner for this set, resisting Vileplume's Ice and Fire weaknesses, appreciating its ability to switch into Fairy- and Fighting-types, and continuing to apply offensive pressure. Dark-types such as Sneasel, Liepard, Cacturne, and Pawniard are immune to its Vileplume's Psychic weakness (RC) and can even Pursuit (remove hyphen) trap them in the former first (nothing wrong with former here really) two's cases (RC) while benefiting from Vileplume checking and beating (this implied) Fairy- and Fighting-types. Pawniard also checks some Flying-types like such as Swellow and Archeops. Pokemon that resist Flying resists like such as Lanturn, Rotom(-Fan), Rotom-S, and Rhydon are useful, and the first two three also double as secondary checks to the Water-types Vileplume can struggle to handle, such as special Samurott. Ninetales loves Vileplume's ability to take a hit from and beat Aqua Jet (remove hyphen) users like such as Carracosta and Samurott, who which otherwise stop its sweep, and to lure Pokemon like Cryogonal to use as set-up setup fodder. Flash Fire makes it Ninetales an excellent switch-in to Fire-type attacks aimed at Vileplume, and it Ninetales also checks a lot of Ice-types. Water-types like such as Seismitoad and Samurott resist Ice- and Fire-type moves attacks and simultaneously also (you can only have one of these things happen at a time, so they're not simultaneous)benefit from it Vileplume checking Grass-types and opposing Water-types. Swords Dance Samurott specifically enjoys Vileplume beating Grass-, Water-, and Electric-types (RC) and breaking down physical walls in general to open up a sweep. Again, Spinners and defoggers like Swanna, Prinplup, and Cryogonal such as Cryogonal, Swanna, and Prinplup are important, (AC) as entry hazards can significantly lower both its Vileplume's durabaility and ability to check things threats.
Other Options
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A Chlorophyll set could potentially be used on a sun team, but it's outclassed by Victreebel because of it's the latter's higher Speed, access to Weather Ball, and ability to go mixed, with Vileplume's only real niche being its higher greater (higher implies a numerical value) bulk. Energy Ball can be used over Giga Drain in on the offensive set for extra power at the cost of some durability. Hidden Power Ground on the offensive set prevents Vileplume from being set-up setup fodder for Garbodor and still hitting hits (I prefer 'while still hitting' but w/e, this is fine too so your call) some Steel-types super effectively. Hidden Power Water allows it Vileplume to function as a lure for Mega Camerupt.
Checks & Counters (removed bullet points) (and add line breaks throughout as well please ^^)
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**Fire-, Flying-(add hyphen), Psychic-(add hyphen), and Ice-types**: Fire-, Flying-, Psychic-, (add space) and Ice-types can switch into a resisted hit in the former two's cases or use their usually good Special Defense to switch into most of its moves in the latter two's, and threaten it with their super effective STABs. Fire- and Flying-type Pokemon can switch into a resisted hit and threaten Vileplume with their super effective STAB moves. Psychic- and Ice-type Pokemon can utilize their typically good Special Defense stats to switch into most of Vileplume's attacks and threaten it with thier super effective STAB moves. (reworded to make this look cleaner and flow better)Mega Camerupt specifically can switch into almost any of its Vileplume's moves, especially if it's a defensive variant, and can even run Sleep Talk for Sleep Powder.(add space)
**Super Effective Coverage**: (titles in c&c are capitalized) Pokemon like such as Lanturn and Sawk can threaten Vileplume as it switches in with super effective coverage moves. Set (remove hyphen) up Setup sweepers such as Lilligant can set up boost (to avoid redundancy) as it Vileplume comes in and heavily dent it with Hidden Power Fire and Ice Punch, respectively. (I'm assuming Feraligatr was mentioned here before and you just forgot to clean it up)
**Entry Hazards**: Entry hazard (remove hyphen) setters such as Garbodor and Ferroseed, while not immediately threatening it to Vileplume, either resist and/or are immune to both of its STABs moves and so can switch in and set up hazards, though they have to watch out for Sleep Powder and/or potentially super effective Hidden Powers. This is compounded by Vileplume's dislike of entry hazards, (AC) as they can turn many 3HKOes into 2HKOes.
**Bulky Setup Sweepers**: Bulky setup sweepers like such as CM Uxie, Klinklang, and RestTalk Malamar (you're implying those sets because you mention them as setup sweepers, also all malamar sets are technically setup so i removed resttalk) can use Vileplume as setup (one word) fodder because of their bulk and Vileplume's sometimes lacking power; however, Malamar has to be careful around Moonblast or and Life Orb (remove hyphen) boosted attacks, (AC) however, and Klinklang also has to watch out for Hidden Power Fire.
**Hard-hitters Hard Hitting Attackers**:(either is fine really but if you opt for the second add a hyphen in 'hard-hitting') Extremely strong moves attacks such as Zangoose's Facade and Silk Scarf Kangaskhan's Silk Scarf Double-Edge can heavily dent it Vileplume, (AC) if not outright KO with some prior damage in the former's case, making Vileplume a very poor answer to them.