Time for gimmicks:
Weavile @ Leftovers
252 Atk, 252 Speed, 4 HP
Swagger + Punishment is a gimmicky combination with Substitute, best used with entry hazard support as this set encourages switching. Substitute grants a shield behind which you hide, set it up on the first switch that expects revenge killing Weavile, and proceed with Swagger as they break your sub. Then continue to set up subs until they hit themselves in confusion, then raise their attack further with Swagger, and then brutally hit them with STAB Punishment. Ice Punch is additional STAB coverage.
Master balls are the cheapest thing ever invented. It's more fun catching everything with balls that can fail. 'caught Latios in the wild without master ball ftw'