Since everyone complains about its mediocre speed stat. I run this set.
Thundurus-T @ Life Orb
Nature : Modest
EVs : 4 Def / 252 SpAtk / 252 Spd
Ability : Volt Absorb
Moves :
~ Agility
~ Thunderbolt/Thunder
~ Hidden Power [Ice]
~ Focus Blast
After an Agility, you reach a staggering 602 Speed...