Tyranitar @Focus Sash
Quiet
252 HP, 252 Attack, 4 Defense EVs
Curse, Payback, Avalanche, Earthquake
Tyranitar is there mainly for sandstorm. He has 0 Speed IVs and a negative nature to ensure he moves last (speed of 63). I thought about an Iron Ball, but then he might get OHKOed by a fighting type move. Basically I just use Curse when I have a chance and pick a move that suits the situation. If I think I will get KOed, I will use Earthquake and take out what I can.
Giratina @Griseous Orb
Modest
252 HP, 252 Spec Attack, 4 Speed EVs
Hidden Power (Fire), Shadow Ball, Dragon Pulse, Protect
Giratina is immune to Tyranitar's Earthquake, which is the main reason I am using him. Hidden Power can take out Abomasnow. Dragon Pulse and Shadow Ball are two good STAB moves to do damage. Protect increases his longevity.
Garchomp @Choice Scarf
Jolly
4 HP, 252 Attack, 252 Speed EVs
Outrage, Rock Slide, Earthquake, Dragon Claw
Garchomp is my revenge killer. He is extremely fast, hard to kill in sandstorm, and can cause flinches with Rock Slide. Rock Slide is the prefered attack because of flinches and it hurts both enemy Pokemon.
Dialga @Adamant Orb
Quiet
252 HP, 120 Attack, 136 Special Attack
Draco Meteor, Thunder, Flamethrower, Brick Break
Dialga is a mixed sweeper who cleans up after Garchomp. Thunder is for if a Kyogre chains the weather, Flamethrower is in case of any Abomasnow, Breloom, and the rogue Shedinja. Draco Meteor is for Palkia and other Dragons if I don't want to use Thunder. Brick Break is for other Dialga and if I lower my Special Attack with Draco Meteor.
My plan with this team is to use Sandstorm, get the first two Pokemon either knocked out or close to it with Earthquake and Giratina. Sandstorm can act like poison, so I won't need to do full KOs. If the weather doesn't go my way, Dialga will switch in on Hail and Rain for Tyranitar. If it goes to Sunny I will bring out Garchomp. Sunny weather, in fact, is my main worry. I have no reliable way to OHKO a Groudon, so if anyone has a suggestion on that I would love to hear it. Dialga does most of the fighting, and, since ideally I only have two Pokemon left to KO before I even have to bring him out, I shouldn't have to worry about Draco Meteor in the long run.
Quiet
252 HP, 252 Attack, 4 Defense EVs
Curse, Payback, Avalanche, Earthquake
Tyranitar is there mainly for sandstorm. He has 0 Speed IVs and a negative nature to ensure he moves last (speed of 63). I thought about an Iron Ball, but then he might get OHKOed by a fighting type move. Basically I just use Curse when I have a chance and pick a move that suits the situation. If I think I will get KOed, I will use Earthquake and take out what I can.
Giratina @Griseous Orb
Modest
252 HP, 252 Spec Attack, 4 Speed EVs
Hidden Power (Fire), Shadow Ball, Dragon Pulse, Protect
Giratina is immune to Tyranitar's Earthquake, which is the main reason I am using him. Hidden Power can take out Abomasnow. Dragon Pulse and Shadow Ball are two good STAB moves to do damage. Protect increases his longevity.
Garchomp @Choice Scarf
Jolly
4 HP, 252 Attack, 252 Speed EVs
Outrage, Rock Slide, Earthquake, Dragon Claw
Garchomp is my revenge killer. He is extremely fast, hard to kill in sandstorm, and can cause flinches with Rock Slide. Rock Slide is the prefered attack because of flinches and it hurts both enemy Pokemon.
Dialga @Adamant Orb
Quiet
252 HP, 120 Attack, 136 Special Attack
Draco Meteor, Thunder, Flamethrower, Brick Break
Dialga is a mixed sweeper who cleans up after Garchomp. Thunder is for if a Kyogre chains the weather, Flamethrower is in case of any Abomasnow, Breloom, and the rogue Shedinja. Draco Meteor is for Palkia and other Dragons if I don't want to use Thunder. Brick Break is for other Dialga and if I lower my Special Attack with Draco Meteor.
My plan with this team is to use Sandstorm, get the first two Pokemon either knocked out or close to it with Earthquake and Giratina. Sandstorm can act like poison, so I won't need to do full KOs. If the weather doesn't go my way, Dialga will switch in on Hail and Rain for Tyranitar. If it goes to Sunny I will bring out Garchomp. Sunny weather, in fact, is my main worry. I have no reliable way to OHKO a Groudon, so if anyone has a suggestion on that I would love to hear it. Dialga does most of the fighting, and, since ideally I only have two Pokemon left to KO before I even have to bring him out, I shouldn't have to worry about Draco Meteor in the long run.