Blissey (F) @ Leftovers
Trait: Serene Grace
EVs: 128 HP / 252 Def / 128 SDef
Bold Nature (+Def, -Atk)
- Wish
- Skill Swap
- Seismic Toss/ Minimize
- Protect
Bronzong @ King's Rock
Trait: Levitate
EVs: 252 Atk / 128 Def / 128 SDef
Adamant Nature (+Atk, -SAtk)
- Earthquake
- Trick Room
- Rock Slide
- Zen Headbutt
I like Bronzong a lot because of the levitate/steel/bulk thing, so let's use it. 1st turn, Bronzong uses Trick Room and Blissey using Skill Swap on it so Bronzy can beast up with hacks. Bronzong's main move will be rockslide.
Rockslide has a flinch chance of 30%
Serene Grace doubles the affects of moves e.g. flamethrower.
King's Rock just adds another 10%
I think the order goes Move/Ability/Item so the chances of flinching is 70%, and by reference, flinching every turn. Seismic toss to kill things off while Bronzy flinches, Zen Headbutt for coverage, Earthquake to kill (Blissey has levitate now because of skill swap), Wish/Protect pretty basic, and last but not least, Minimize (if you want) so that Blissey can survive on her own if Bronzong dies.