Uh yeah so i fail to see what that Serperior accomplishes bar getting walled by everything including life itself. Just use the standard Sub Coil Dragon Tail Leaf Blade set it totally outclasses that. :/
Raikou @ Leftovers
EVs: 248 HP/160 Def/4 Spd/96 SDef
Bold nature (+Def, -Atk)
- Roar / Calm Mind
- Sleep Talk
Tank Raikou, use with a cleric or W/E and you hard wall all other electrics (you outstall other Raikou barring a crit because they cannot recover and you can), Crobat, Honchkrow, Togekiss and other retarded things in UU etc. Use with hazards and over the course of a match you will beat each and every one of this things counters apart from Flygon. Toxic Spikes are most notable.
Evs let you live Life Orb Gat'r EQ and cushion Brave Birds from Krow and also cushion LO Zapdos Heat waves. You can use more sp.def if you want to. Max Sp.Def makes Zapdos LO Heat Wave a 4HKO.