Ok that's a stupid idea that I like to use in my Draft League match.
But make a Chandelure crest that gave him the Iron Ball effect (so divide the speed by 2) but setup Trick Room as it enter the field (this could be use by Nim/Lorna)
Other random idea from my past Draft League experience:
-Drapion crest: give him a focus energy on all his move (making a Sniper set really good). And maybe give some kind of boost in atk
-Hydreigon crest: Gave it parental bond for each head on special move but the 2 head only does 20%/30% of the first head damage (we still need to fight the dragon gym)
