Ok I decided to retype my thing on Cresselia
Ok so everyone knows about the Fairy type now right? That ish is immune/resistant to Dragon, resists Dark/is weak to dark apparently and is super effective to Dragon. It also is weak against poison and steel but lol who uses those attacks?
Anyway here's where shit gets crazy. Dragons are the most dominant pokemon in the game and they typically carry Fire/Dragon/Ground coverage, as nothing in the game resists that combo. Cresselia already gets Ground so it has to worry about Dragon and Fire BUT WAIT
If Cress gets the fairy type like expected it can sponge Draco Meteors and Outrages all goddamn day, only having to fear sun boosted moves, which it can most likely heal off anyway with Moonlight.
The only dragon (Outside the weird ass Crunch variants of shit like Salamence) that can POSSIBLY break through is Hydreigon, but since we're not entirely sure if Fairy resists Dark or is weak to it, that might not be an option.
Not to mention Cress can stop so many other pokemon, and we haven't even seen the rest of the Fairy types resistances. It's a godsend man. But then again this is all depending on if Cress even is a fairy.