Dialga @ Shuca Berry
Quiet
252 SpA/ 252 Hp/ 4 Def
- Trick Room
- Dragon Pulse
- Flamethrower/ Aura Sphere
- Protect
He of course sets up Trick Room, and abuses it. Shuca Berry is to live through Earthquake from Groudon. I'm considering replacing Flamethrower with Aura Sphere to defeat other Trick Room Dialga leads; while they either do the work for me and set up or go on the offensive immediately, I fire off an attack and gain an instant advantage.
Smeargle @ Focus Sash
Jolly: Technician
252 Spe/ 252 Atk/ 4 HP
- Follow Me
- Fake Out
- Taunt
- Helping Hand
I've come to find that Smeargle is the most reliable compliment to Dialga for quite a few reasons: of course, the standard Follow Me-Trick Room strategy. Then, there's Fake Out to prevent Dark Void Smeargle from crippling my team, as well as to stop the double-Earthquake strategy. Taunt is to prevent the myriad of set-ups which include Imprison and Wobbuffet tactics, among other things. Helping Hand is to support Dialga, if Smeargle is somehow still standing.
Metagross @ Iron Ball
Brave
252 Atk/ 144 SpA/ 112 HP
- Gyro Ball
- Hammer Arm
- Grass Knot
- Rock Slide
The star sweeper of the team and counter to Iron Ball Tyranitar. After one Hammer Arm, Gyro Ball will probably top out and he outspeeds Tyranitar. Grass Knot and the given EV's OHKO 252/0 Groudon. Rock Slide is for Ho-Oh specifically, but also adds coverage and the ability to hit both opponents.
Giratina-O @ Griseous Orb
Brave
252 SpA/ 252 Atk/ 4 HP
- Shadow Force
- Shadow Sneak
- Dragon Pulse
- Earth Power
Shadow Force acts like Protect in itself, and prevents stalling out Trick Room to an extent. Shadow Sneak is if I need to go first given whatever circumstance, Dragon Pulse is for STAB and type coverage, and Earth Power is also for type coverage.