Example Water Team

Swampert @ Leftovers
Ability: Torrent
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Earthquake
- Roar
- Stealth Rock
- Protect

Tentacruel @ Black Sludge
Ability: Liquid Ooze
EVs: 252 HP / 100 SAtk / 156 SDef
Calm Nature
- Scald
- Sludge Bomb
- Giga Drain
- Rapid Spin

Lanturn @ Leftovers
Ability: Volt Absorb
EVs: 252 HP / 108 Def / 148 SDef
Sassy Nature
- Volt Switch
- Scald
- Thunder Wave
- Heal Bell

Gyarados @ Leftovers
Ability: Moxie
EVs: 4 Def / 252 Atk / 168 Spd / 84 HP
Jolly Nature
- Waterfall
- Bounce
- Dragon Dance
- Substitute

Greninja @ Choice Specs
Ability: Protean
EVs: 252 Spd / 252 SAtk / 4 Atk
Naive Nature
- U-turn
- Hydro Pump
- Ice Beam
- Extrasensory


Keldeo @ Choice Scarf
Ability: Justified
EVs: 252 Spd / 252 SAtk / 4 Atk
Naive Nature
- Hydro Pump
- Secret Sword
- Hidden Power [Grass]
- Stone Edge