Personally, I don't think there are any awesome partners for Crobat Prime.
There area few that I know of.
1. Dugtrio PL. This will be rotated soon, so not much of a choice. I'm pretty sure it stacks, though.
2. Vileplume, Victreebel, Dodrio UD, Crobat. Crobat, Severe Poison, switch next turn...