Jolteon
Choice Scarf Jolly 252 SP Attack 252 Speed 6 HP
HP Ice
Shadow Ball
Baton Pass
Thunderbolt
Can outspeed the entire metagame really
Revenge kills Flygon, Dragonite with 1 DD dance, Gyarados, Kingdra, Rotoms, Gengar, Starmie, and Suicune, Even Empoleon after it sets up is destroyed...