The hidden grotto Minccino that Bianca finds you before you go to Driftveil was my MVP because of Skill Link. After it turned into a Cinccino, it had a move that had a base power of 182.5 and two more with guaranteed 125 power (Because Wide Lens added 10 accuracy to everything.) with good attack to begin with. It even had a nature that increased its attack. (At the expense of Defense.) It is also very fast.
It was a true glass cannon.