I'm a bit late to this discussion, but if you wanna be cheap AF and infuriate your opponent, this is what I use...
Umbreon @ Leftovers
Ability: Inner Focus
EVs: 252 def. 252 sp def. 4 hp
-Payback (recommend PP Max)
Use double team until max evasiveness, toxic, then payback. Whenever HP is in the yellow, moonlight + Leftovers, your likely back to full HP, ready to dodge almost anything they throw at you, but if one o' their Pokémon knows Aura Sphere, sorry my friend, but you're f*****. I typically do double/triple battles, so I get rid of them ASAP with my other Pokémons. Hope this helps!