this might just work

Charizard @ Charizardite Y
Ability: Blaze
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Heat Wave
- Overheat
- Solar Beam
- Protect

Venusaur @ Venusaurite
Ability: Chlorophyll
EVs: 252 HP / 124 Def / 76 SpA / 52 SpD / 4 Spe
- Giga Drain
- Sludge Bomb
- Leech Seed
- Protect

Cresselia (F) @ Mental Herb
Ability: Levitate
- Psyshock
- Ice Beam
- Helping Hand
- Moonlight

Rhyperior @ Sitrus Berry
Ability: Solid Rock
- Rock Slide
- Earthquake
- Substitute
- Protect

Conkeldurr @ Assault Vest
Ability: Guts
EVs: 164 HP / 252 Atk / 12 Def / 80 SpD
Adamant Nature
- Drain Punch
- Mach Punch
- Ice Punch
- Knock Off

Gastrodon @ Leftovers
Ability: Storm Drain
- Scald
- Ice Beam
- Earth Power
- Protect