my vaporeon aggrivates the hell out of people
MISTERIO
leftovers
EV 252 hp 252 sp def 6 sp att
ice beam
surf
acidarmor
substitute
(you could use aqua ring instead of one of the sp attacks or substitute)
it can survive almost any sp att so thats when you send it out and acid armor at least once then substitute (it's all about knowing how many hits it can take, think before you send it out). then you have a near indestructable sub with over 100 hp, great sp def, and crazy physical def due to acid armor. by the time they take out the sub you've done some good damage and leftovers has healed you quite a bit.
just ask ajkid how annoying it is :D
you could replace both sp attacks with aqua ring and toxic but then you have to look out for pkmn immune to poison
VAPOREON is an incredible pkmn
meganium
toxic
ingrain
leech seed
giga drain
self explanatory