Malamar is actually pretty decent, particularly if you get Contrary ability on it because it complements Superpower, one of its level-up moves, really well. Suction Cups is handy if you are into chain fishing as well.
As for evolving Inkay, it's at Level 30 when your 3DS is held upside down.
As for evolving Inkay, it's at Level 30 when your 3DS is held upside down.