if chansey is giving you problems, here's a niche counter you can easily fit on your team:
Snorlax @ Toxic Orb
Ability: Poison Heal
EVs: 144 HP / 188 Def / 176 SpD
Sassy Nature
IVs: 0 Spe
- Facade
- Knock Off
- Roost
- Swords Dance/defog/earthquake/toxic/protect/baton pass/whatever you want really.
after testing breloom with lax, i decided after seeing some amazing results with another person using gliscor, that i would try it too, and needless to say, its bulky as fuck. the evs are the typical "curselax" but since lax lacks curse, its more of a "offensive wall/pivot then anything, the ivs and nature are the kicker, snorlax is slower then chansey, and therefore, it will outslow chansey, preventing it from doing anything to lax, and lax doesnt fear burns/taunt due to poison heals recovery. facade hits deceptively hard even if uninvested, and knock off gives good coverage, only missing out on 2 pokes iirc. roost is obviously for recovery. and the last move....is really up to preference. if you need a defogger, lax can do it, if you need a stallbreaker, swords dance/taunt/toxic can work, if you want a pivot, baton pass works wonders, and if you just want to troll, protect works too. i was wondering why chansey was so big of a deal, but then i realised i was using a counter to it the whole time. lel. though i can see why taunt, will o, recover, metal burst could be deceptively annoying.