Grass / Ghost
Psychic
I like Grass/Ghost the best for its synergy with all possible movesets CAP2 could run (Stat-Boost, All out attacking, Support). Psychic meanwhile sounded cool, and I prefer it immensely to the Poison typings, specifically Poison/Dragon. Dragon, Ice, and Ground are three of the best offensive types in the game, and almost everything with an offensive pulse carries one of those three, making it difficult to abuse the stat up possibilities, specifically Shell Smash.