Galladiator

I've done several playthroughs and found a couple standout mvps Magneton/magnezone are just so good with that many resistances he walls several gym leaders. Mamoswine surprisingly good in reborn. Surprise mvp butterfree, with compoundeyes to boost sleep powder and hurricane's accuracy plus quiver dance. Mine beat the arceus solo and quiver dance gets a double boost in the circus gym fights to solo sweep them. But best mvp I ever had was a moxie scrafty that got dragon dance as an egg move. Moxie is so overpowered and he could solo pretty much any single battle.

Nobodys mentioned Vigoroth so I figured I should throw him out there. Slakings great but vigoroth doesn't have to deal with that god awful ability. Electabuzz would probably be my number one. But I always loved the way vibrava looks.