Mega Swampert Rain

Pelipper @ Damp Rock
Ability: Drizzle
EVs: 248 HP / 252 SpA / 8 SpD
Modest Nature
- Surf
- Hurricane
- U-turn
- Defog

Swampert-Mega @ Swampertite
Ability: Swift Swim
EVs: 108 HP / 252 Atk / 148 Spe
Adamant Nature
- Waterfall
- Earthquake
- Ice Punch
- Power-Up Punch

Hawlucha @ Electric Seed
Ability: Unburden
EVs: 192 HP / 252 Atk / 64 Spe
Adamant Nature
- Acrobatics
- High Jump Kick
- Swords Dance
- Poison Jab

Ferrothorn @ Leftovers
Ability: Iron Barbs
EVs: 252 HP / 88 Atk / 48 Def / 120 SpD
Brave Nature
IVs: 0 Spe
- Gyro Ball
- Power Whip
- Leech Seed
- Stealth Rock

Tapu Koko @ Life Orb
Ability: Electric Surge
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Thunder
- Volt Switch
- Dazzling Gleam
- U-turn

Kingdra @ Waterium Z
Ability: Swift Swim
EVs: 168 HP / 252 SpA / 88 Spe
Modest Nature
IVs: 0 Atk
- Hydro Pump
- Draco Meteor
- Ice Beam
- Surf