It can be anything, however small or even petty! See how they balance out.
LIKES: -Playing with your pokemon and all their new animations. -My long-awaited barnacle pokemon is cooler than I'd have hoped for. -My long-awaited Jack O' Lantern pokemon is...acceptable. -Klefki is cool looking and original. -Trevenant is pretty awesome -Mega Kanga is an adorable concept, megas overall are a neat addition -Aromatisse looks like some sort of creepy goblin -Sliggoo is up there with my two or three favorite designs of all time
DISLIKES: -Only one new bug line and it's a butterfly. -Only one new poison line, though it's a neat one. -Many long-awaited, fairly basic animals still unrepresented. Desperately wanted a fly and cockroach since gen 1. -Megas seemingly used as a substitute for more new species. -No Mega pokemon revealed so far is something I would use. -Goodra does not appeal to me a bit. Now I know how Dragonair lovers feel.