Dragonite @ Leftovers
Ability: Multiscale (Inner Focus is fine on a budget)
IVs: 20+ HP / 20+ Def / 20+ SpDef
EVs: 252 HP / 6 Def / 252 SpDef
Calm or Careful Nature
-Safeguard
-Substitute
-Roost
-Rest

Poliwrath @ Black Belt
Ability: Water Absorb
IVs: <15 HP / 31 Atk / 20+ Def / <15 SpDef
EVs: 252 HP / 252 Atk / 6 Def
Adamant Nature
-Drain Punch
-Waterfall
-Belly Drum
-Rest

Rotom-Heat @ Magnet
Ability: Levitate
IVs: 25+ SpA / 25+ Spe
EVs: 6 HP / 252 SpA / 252 Spe
Modest Nature
-Thunderbolt
-Nasty Plot