EVS: 252 HP/ 24 sp. def./ 232 speed
-Giga Drain/ Taunt
3rd fastest SubSeeder in the game (beaten by sceptile and whimsicott). But Serperior's advantage is his bulk. 354 HP and around 230 sp def. allow him to come in multiple times. Glare is great to cripple a sweeper/scarfer they try to bring in on him. Sub up until they switch or get parahax'd. Leech Seed to get back extra HP and break some walls. Giga Drain to get back extra HP, thanks to its boosted base power. Taunt if you want to run a more stalling version.
Overall: great subseeder, good defenses, fast, and can take multiple hits. Glare sets it apart from other subseeders in the fact that most don't get status.
Teammates: Fire types and water types are your friends. They cover serperior's weaknesses and provide the good basic fire/water/grass combo. Heatran and Jellicent work with serperior perfectly.
Counters: Grass types completely and utterly wall this set. Shaymin especially with immunity to leech seed and natural cure to get rid of paralysis, then fight back with HP Fire/Ice. A scarfer that can U-Turn to damage/ break sub work too, but watch out for glare. Of course fires work too.
Keeping the classics alive