Guaranteed Water Spout

Gengar @ Gengarite
Ability: Levitate
Level: 50
EVs: 6 HP / 252 SpA / 252 Spe
Timid Nature
- Trick Room
- Sludge Bomb
- Protect
- Shadow Ball

Kyogre-Primal @ Blue Orb
Ability: Primordial Sea
Level: 50
EVs: 252 HP / 252 SpA
Quiet Nature
IVs: 0 Spe
- Water Spout
- Origin Pulse
- Protect
- Ice Beam

Cresselia @ Mental Herb
Ability: Levitate
Level: 50
EVs: 252 HP / 76 SpA / 180 SpD
Sassy Nature
IVs: 8 Spe
- Icy Wind
- Skill Swap
- Psyshock
- Reflect

Xerneas @ Power Herb
Ability: Fairy Aura
Level: 50
EVs: 6 HP / 252 SpA / 252 Spe
Timid Nature
- Geomancy
- Dazzling Gleam
- Thunderbolt
- Protect

Landorus-Therian @ Life Orb
Ability: Intimidate
Level: 50
EVs: 6 HP / 252 Atk / 252 Spe
Adamant Nature
- Earthquake
- Explosion
- Protect
- Superpower

Talonflame @ Sharp Beak
Ability: Gale Wings
Level: 50
EVs: 6 HP / 252 Atk / 252 Spe
Adamant Nature
- Taunt
- Brave Bird
- Tailwind
- Will-O-Wisp