The idea of this team is that every Pokemon save lugia either makes (and benefits from) its own weather, or destroys it. this team is built to screw around with opposing weather teams, as well as being unpredictable and unique.
Kyogre - sp. sweeper - leftovers
EVs: 252 sp. atk, 252 sp. def, 4 spd
Nature: modest
Ability: drizzle
Moves:
Surf/hydro pump (STAB, reliability VS. power)
Ice beam (what with the slew of dragons in ubers, I figure an ice move is almost a necessity)
Thunder (hits other kyogres)
Substitute (no explanation necessary)
Groudon - physical sweeper - life orb
EVs: 252 atk, 252 spd, 4 def
Nature: adamant
Ability: drought
Moves:
Earthquake (with his attack stat, you would have
to be an idiot to not have e-quake)
Fire punch (hits grass and ice types, hits pretty hard with the sun boost)
Stone edge (hits flying types, namely ho oh)
Rock polish (let's him hit first)
Rayquaza - physical sweeper #2 - Chesto berry
EVs: 252 atk, 252 spd, 4 HP
Nature: Jolly
Ability: air lock
Moves:
Dragon dance (great boosting move)
Outrage (insane demolition after a d-dance or two)
Brick break (coverage)
Rest (heals off damage taken from outrage confusion, chesto berry wakes me up)
Tyranitar - physical tank - leftovers
EVs: 252 atk, 252 def, 4 HP
Nature: adamant
Ability: sand stream
Moves:
Stone edge (STAB)
Crunch (STAB)
Stealth rock (just because)
Curse/bulk up (boosts for tanking)
Abomasnow - special sweeper #2 - choice scarf
EVs: 252 spd, 252 sp. atk, 4 HP
Nature: modest
Blizzard (Main STAB)
Giga drain (STAB)
Hidden power ground (coverage)
Shadow ball (no real reason here, I just couldn't thnk of anything else)
Lugia - Wall - leftovers/light clay
EVs: 252 sp. def, 252 HP, 4 def
Nature:
Ability: multiscale
Moves:
Toxic (What wall doesnt have toxic?)
Recover (Great for stalling w/toxic)
Dragon tail (Gets resisting opponents out of the way)
Reflect (Doubles his defense, eliminating the need for defense EVs)