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If trading is an option, use Conkeldurr. It'll be fully evolved by Elesa if you want it to be, and it has a ton of powerful moves to slap everyone's shit sideways. Its abilities are great, with Guts letting Conkeldurr laugh at status hax and Sheer Force letting it use a strong-as-hell Low Sweep, Bulldoze, and Rock Slide. If you've got the shards, you can even use the Elemental Punches on it to beef up its coverage even more.
But yeah, Conkeldurr is fucking boss in BW2. Almost single-handedly beat Challenge Mode Iris for me.