Deoxys-Defense @ Red Card
Ability: Pressure
EVs: 252 HP / 128 Def / 128 SpD
Calm Nature
- Toxic
- Recover
- Cosmic Power
- Stealth Rock / Night Shade
So, Deoxys is a classic staller which can set up Stealth Rock, which helps in countering Multiscale Lugia. Red Card helps him when the foe sends out an enemy that cannot be killed with Toxic. Cosmic Power increases Deoxys' enormous Special Attack and makes him very difficult to kill. Another option instead of Stealth Rock is Night Shade since he may get taunted.
Kyogre @ Chesto Berry
Ability: Drizzle
EVs: 252 HP / 128 SpD / 128 SpA
Modest Nature
- Calm Mind
- Rest
- Thunder
- Water Spout
With this one, I set up rain and I take some advantages. I use Thunder instead of Ice Beam since Kyogre will have problem against other Kyogre or Lugia. Its basic strategy is a Chesto-Rest strategy which lets him boost while recovering HP.
Manaphy @ Life Orb
Ability: Hydration
EVs: 252 Spe / 252 SpA / 4 HP
Timid Nature
- Tail Glow
- Rest
- Surf
- Ice Beam
The ultimate rain abuse. I boost one or two times with Tail Glow, then I Rest, and for ending I kill everything with Surf. I used to have Grass Knot instead of Ice Beam, but I switched it because I needed more coverage against Dragon types.
Zekrom @ Leftovers
Ability: Teravolt
EVs: 252 Atk / 252 Spe / 4 HP
Jolly Nature
- Hone Claws
- Bolt Strike
- Stone Edge
- Dragon Claw
This nice sweeper is Lugia's and Kyogre's counter. It hits them with super effective Bolt Strike, and the nice thing is that damage are physical. After two Hone Claws he can defeat anything.
Latias @ Soul Dew
Ability: Levitate
EVs: 18 HP / 128 Def / 252 Spe
Timid Nature
- Calm Mind
- Mist Ball
- Surf
- Dragon Pulse
A tank which takes some turns to boost with Calm Mind, and then he has great bulk as well as Speed. Also some rain abuse is made due to Surf. Dragon Pulse is STAB and helps with countering Dragon types which have no weakness to Ice such as Palkia and Reshiram.
Darkrai @ Focus Sash
Ability: Bad Dreams
EVs: 252 SpA / 252 Spe
Timid Nature
- Dark Void
- Nasty Plot
- Ice Beam
- Dark Pulse
Dark Void plus a few Nasty Plot boosts and he destroys whatever he finds in his path. Dark Void also helps him onto sweeping and ability abuse.