Pretty sure if I ever lost a match to that I would quit Pokemon.
Exploud @ Sitrus Berry
EVs: 208 HP / 48 SpA / 252 Spe
- Hammer Arm
This Exploud set is a complete stall matchup fish, but you shouldn't be able to lose to Chansey teams if you play this thing right
and don't miss.
Whirlpool traps, with Taunt stopping recovery, and Hammer Arm/Boomburst + Whirlpool bringing the chans/pex pivot down.