Whimsicott list!
Floor 1 - Absorb, Growth, Leech Seed, Mega Drain, Cotton Spore
Floor 2 - Stun Spore, Razor Leaf, Gust
Floor 3 - Poisonpowder, Giga Drain, Charm, Return, Frustration, Safeguard, Tailwind, Light Screen
Floor 4 - Helping Hand, Energy Ball, Cotton Guard, Sunny Day
Floor 5 - Endeavor, Solarbeam, Hurricane
Floor 6 - Giga Impact, Hyper Beam
Floor 7/8 (Non-storebought TMs) - Dream Eater, Grass Knot, Swagger, U-Turn, Substitute, Trick Room, Flash, Rest, Attract, Thief, Round, Energy Ball, Fling, Facade, Psychic, Shadow Ball, Double Team, Hidden Power, Taunt, Toxic
F8+ (Egg Moves) - Natural Gift, Encore, Tickle, Fake Tears, Grasswhistle, Memento, Beat Up, Switcheroo, Worry Seed
Given that, by F3, Whimsicott is capable of Light Screen, Tailwind, Safeguard, Cotton Spore, Stun Spore or Charm, I can definitely see it being a 2.5 or even a 3.0. Incredible status and support options and some fantastic variety, but it's quite frail and has a few major weaknesses. (Primarily Fire/Ice/Wind)