I want to make my case for Thundurus-T to make it to C+ from C. I think it is at least more viable than mons like Quilfish or Niheligo in the current meta.
I have been using this set
Thundurus-Therian @ Fightinium Z
Ability: Volt Absorb
EVs: 4 Def / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Thunderbolt
- Hidden Power [Ice]
- Focus Blast
- Sludge Wave
and this mon brought me close to the top 500 on the ladder, not that impressive for a lot of you guys, but I was never that high.
This set has insane coverage, has only 2 relevant safe switch-ins with Chansey and AV Magerna and OHKO/2HKO and outspeeds a lot of popular mons like Ferro, AV Bulu, Heatran, Lando-T without Stone Edge, Toxapex, Celesteela, Clef, Kyurem-B, T-Tar without AV, Magnezone, Gliscor, Zapdos and so on. A lot of these mons have risen up recently as well like the last 2.
The lack of NP catches people off-guard and while still being viable option, I simply preferred the great coverage. Thanks to its typing, it can even live hits from faster mons like Tapu Koko, M-Pinsir, non-Z-Move Kartana and +2 Hawlucha and OHKO them back. I also think that it shouldn't be lower than its other form, which only fits on the dying Webs playstyle anyways. While outspeeding Kartana or Keldeo is nice (which are both often Scarfed anyways), Volt Absorb to stop Volt Switches is always nice and the extra power can be crucial to OHKO/2HKO mons. Plus, it has better chances against Zapdos or Magnezone. Mons like M-Venusaur and Blace dropped recently, too.
Alone being good against Pex, Heatran and Lando-T is pretty nice tbh. Yeah, I know all of its flaws, but the benefits are potentially huge and it is worth being at least on the same level as Hydreigon or Volcanion, which I have both have not seen in ages.