Trying to build a team that setups Mega Ampharos but still has something to fall back on. I'm flexible on dropping Vaporeon, Hitmontop, and Weavile. But for who?

Suggestions?

PhoenixDown (Ampharos-Mega) @ Ampharosite
Ability: Mold Breaker
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Dragon Pulse
- Thunderbolt
- Volt Switch
- Focus Blast

Excelsior‼ (Venomoth) @ Black Sludge
Ability: Wonder Skin
Shiny: Yes
EVs: 248 HP / 8 Def / 252 Spe
Timid Nature
- Baton Pass
- Quiver Dance
- Sleep Powder
- Substitute

~Black Sonic~ (Weavile) @ Life Orb
Ability: Pressure
EVs: 252 Atk / 24 Def / 232 Spe
Jolly Nature
- Knock Off
- Ice Shard
- Low Kick
- Ice Punch

BeMySenpai (Rotom-Wash) @ Leftovers
Ability: Levitate
Shiny: Yes
EVs: 252 HP / 212 Def / 44 Spe
Bold Nature
- Hydro Pump
- Volt Switch
- Thunderbolt
- Will-O-Wisp

DreidelDreidel (Hitmontop) @ Assault Vest
Ability: Intimidate
EVs: 252 HP / 252 Def / 4 Spe
Impish Nature
- Sucker Punch
- Close Combat
- Stone Edge
- Toxic

Vaporeon @ Leftovers
Ability: Water Absorb
EVs: 248 HP / 252 Def / 8 SpA
Bold Nature
- Scald
- Wish
- Substitute
- Protect