0547 Whimsicott

Fairy Wind provides Whimsicott the energy gain to reach its rather expensive Charged Attacks and utilize its rather unique coverage.

Both Charm and Razor Leaf sport the highest damage output from fast moves in the game, but also tie for the worst energy generation. Charm is generally preferred, as many other Grass-type Pokemon have access to Razor Leaf.

Seed Bomb costs the least amount of energy among Whimsicott's charge moves and benefits from STAB, but its damage can be lacking. Charm Whimsicott should run Seed Bomb to compensate for Charm's low energy gain. Grass Knot costs slightly more energy but deals considerably more damage; it is the preferred Grass option if running Fairy Wind. Moonblast costs 5 less energy than Hurricane, but both are very slow to access and are different typings. Either can be chosen, though poor energy generation may limit access to them. 

Whimsicott is the first Pokemon introduced to Pokemon GO to sport both the Grass and Fairy typing, and as a result stands out from other Pokemon with similar typings. Respectable bulk, high energy generation and a unique typing lets Whimsicott pressure certain combinations, but common weaknesses and competition from other Grass-type Pokemon hold it back.

With a max CP of 2277, Whimsicott lacks adequate stats to perform well outside of Great League. Powerful Fairy typing and access to STAB Charm can prove valuable against common Fighting-types and Dark-types in this league, though Whimsicott may struggle against the rest of the meta. 

Fairies may be good against Dragons, but maybe consider a stronger Fairy?