A command idea I had that would be fun to use and would come in handy (in my opinion, at least):
/mega [pokemon]:
It would list the stat changes between the pokemon and its mega form(s). Example:
/mega charizard
Mega Charizard X:
Ability: Tough Claws
HP Atk Def SpA SpD Spe
+0 +20 +0 +50 +30...