Chansey (F) @ Eviolite
Trait: Natural Cure
EVs: 40 HP / 252 Def / 216 SDef
Brave Nature (+Atk, -Spd)
- Seismic Toss
- Toxic
- Aromatherapy
- Softboiled
Sadly, the Chansey has to have a Brave Nature, a Def boosting nature would have helped allot, and Atk is useless on Chansey.
Anyway, Chansey is one of the best walls/T-stallers in the game, as well as being a good cleric. Eviolite helps it out allot, making it's defensive bulk large than Blissey, and it still has that huge HP stat. This set is pretty simple, counter a wall with it, or stop a sweeper dead in its tracks. Seismic Toss is the only Attacking move that should ever touch Chansey, as it's pitiful offensive stats won't allow anything of greater use. Toxic is the main killer on this set, Softboiled recovers any hits offf quickly, and Aromatherapy/Heal Bell helps knock off opposing toxic/burn etc.
The EVs might look weird for a Chansey, but they allow Eviolite to be more effective. 651 Hp is a pretty good stat anyway, nothing to complain about.
If you plan to evolve it, I would suggest a Blissey like this:
Blissey (F) @ Leftovers
Trait: Natural Cure
EVs: 200 HP / 252 SAtk / 56 SDef
Brave Nature (+Atk, -Spd)
- Fire Blast / Shadow Ball
- Grass Knot / Focus Blast
- Softboiled
- Calm Mind
This is my own personal Blissey, with a sub-par nature. Item is pretty obvious, 1/8 recovery of 701 HP is incredible. I like 701 HP simply because it has over 700 hp, and if, for some reason, someone wanted to try to Seismic Toss this thing to death, it would take 8, not including recovery. Attacks are straightforward, they each attack the main 4x weaknesses in today's meta. I prefer the Shadow Ball / Focus Blast combo, as it hits everything at least neutral. Both sets will handily scrap Jellicent + Ferrothorn. Softboiled is recovery, if Wish is possible, it can help too, especially for your team. Calm Mind makes this thing even more of a tank, and boosts its offensive ability.