I think its about time we had one of these threads again

Whats your favorite pokemon game and why? It can be mainline, a spinoff, a romhack, a fan game, whatever. And why do you hold it as your favorite, or claim its the best in the series?

Im not too sure myself, though as of late ive been having alot of fun with pokemon crystal clear. Though, I wish it had pokemon from throughout the series (I feel like alot of gen 6's lineup is underrated)