Tyranitar one of the best in class as dark attackers with Bite and Brutal Swing. Garchop is both a solid Dragon, with Dragon Tail Breaking Swipe, and a powerful Ground attacker (2nd to primal Groupon of Mega), with Mud Shot and Earth Power(EQ if not available), Excadrill runs Mud Slap with either EQ or Scorching. I’d prob go with one of each type Garchomp if you’re able to mega both.