484 Palkia

Spatial Pokémon: It has the ability to distort space. It appears in Sinnoh-region myths as an ancient deity.

Ability: Pressure - When this Pokémon is hit by a move, the opponent’s PP lowers by 2 rather than 1.

Types: Water & Dragon

Meet at Spear Pillar, level 47: PEARL ONLY

Base Stats
HP 90
Attack 120
Defense 100
Special Attack 150
Special Defense 120
Speed 100

Total: 680

Special Attacker
Nature: Modest/Timid
Item: Lustrous Orb/Choice Specs
EVs: 6 HP / 252 Special Attack / 252 Speed
Spacial Rend
Earth Power/Aura Sphere
Ice Beam/Thunderbolt/Flamethrower

With a 150 Special Attack stat, it is an easy decision to exploit its largest strength! It also has been given the best special attack move set of any Uber pokemon. 252 special attack EV is obvious, maxing out speed allows Palkia to hit first on any other 100 speed Uber. Special Rend and Surf are definite moves with the Lustrous Adamant Orb, otherwise pick your favorite four and roll with it! Dragon attacks are the only attacks that are super effective against Palkia, however most Ubers that attack will carry a dragon move.

Physical Attacker
Nature: Adamant/Jolly
Item: Lustrous Orb/Choice Band/Expert Belt/Life Orb
Evs: 6 HP / 252 Attack / 252 Speed
Dragon Claw
Aqua Tail/Brick Break
Shadow Claw/Stone Edge

Even though its special attack is a lot higher, Palkia can be effective physically too. Physical attack set has a lot of counter moves against typical Uber match-ups. Aqua Tail and Lustrous Orb are best used with Kyogre setting up rain support.

Mixed Attacker
Nature: Brave/Quiet/Hasty...or happily eats anything
Item: Lustrous Orb/Expert Belt/Life Orb
EVs: 6 HP / 252 Attack / 252 Special Attack
Draco Meteor
Dragon Claw
Aqua Tail

Not one of my favorite options but a lot of people prefer this build. This set also really needs Kyogre for rain support.