Seems interesting but very incomplete.
A few things to help you fill out (accept or ignore at your leisure):
[*]Clear Body prevents all stat lowering (relevant: the Regis' Superpower and Metagross' Hammer Arm)
- White Smoke should also do this (Relevant: Torkoal and Heatmor's Overheat).
[*]Hail is improved:
Silver Wind, Ominous Wind, and Avalanche deal 1.5x as much damage in Hail
Snow Cloak no longer modifies evasion, but instead decreases damage by 25% in Hail (and 12.5% out of Hail)
Ice Body has 30% chance of freezing a contact move (and grants passive healing out of Hail, too)
Thick Fat grants immunity to Hail damage
- Hail should also increase the Defense of Ice types by 1.5x to mirror Sandstorm's SpD boost (HAIL STALREIN).
[*]New mechanic: Signature Pokemon:
Certain moves have a Signature Pokemon associated with them. A move will deal 1.5x its usual damage when used by its Signature Pokemon. Some of these moves also receive other changes that apply to all Pokemon using the move - those changes are listed in parentheses.
- I think this can be expanded to include effects and non-attacking moves, such that it would increase effect chance / result by 1.5x (rounded up) and make the move perfectly accurate. Examples:
Rapidash: Flame Charge: +2 Spe, perfect acc.
Flareon: Fire Fang: 30% burn, 45% flinch chance, perfect acc.
Jolteon: Agility: +3 Spe
Vaporeon: Aqua Ring: (now heals 3/16ths HP instead of 1/8th), Baton Passes as a 3/16ths gain.
Espeon: Morning Sun: (now heals 37.5/75/100% HP based on weather)
Umbreon: Moonlight: (now heals 37.5/75/100% HP based on weather)
Leafeon: Grasswhistle: (now perfect acc)
Glaceon: Icy Wind: -2 Spe (-1 * 1.5 rounded up), perfect acc.
[*]New mechanic: Intrinsics:
Pokemon that previously get Levitate are now immune to Ground intrinsically. Instead, they get new abilities in addition to their Ground immunity:
- My suggestions along with what you have:
Gastly -> Gengar - Infiltrator
Koffing -> Weezing - Aftermath
Misdreavus -> Mismagius - Soundproof (This is awesome with Perish Song)
Unown - Analytic
Vibrava -> Flygon - Sand Force (Flygon's eyes are more like goggles, not segmented, and Trapinch's DW ability is Sheer Force to provide contrast.)
Lunatone -> - Tinted Lens (Its eyes are red and moonlight is reflected sunlight)
Solrock -> - Drought
Baltoy -> Claydol - Analytic
Duskull - Pressure
Chingling -> Chimecho - Soundproof (See above with Mismagius, except it also makes Chimecho immune to Bug Buzz, an effect it benefits more from.)
Latias - Rivalry
Latios - Rivalry
Bronzor -> Bronzong - Heatproof
Carnivine - Prankster
Rotom -> Motor Drive
Rotom-C - Sap Sipper
Rotom-F - Ice Body
Rotom-H - Flash Fire
Rotom-S - Sheer Force
Rotom-W - Storm Drain
Uxie - Frisk
Mesprit - Moody (If this just avoided Evasion/Acc boosts/drops it'd be fine)
Azelf - Sheer Force
Giratina-O - Mold Breaker
Cresselia - Pressure
Tynamo -> Eelektross - Volt Absorb
Cryogonal - Ice Body
Hydreigon - Pressure