I gave my Trick-Metagross the move Ice Punch for his only attack, because he's ev trained in HP and Speed so that he can perform his main duties of Tricking the opponent and Protect+Flash stalling well. Even though he has an Adamant (+Atk -specialAtk) nature, attacking isn't his main job.
With Ice Punch he can OHKO things that are 4-times weak to ice despite his less than stellar attack stat, and there are lots of things that have this weakness. It helps him clear away Grass Pokemon who might harm Suicune and Gliscor, as well as allowing him to dispose of Dugtrio who might trap him with the ability Arena Trap. If he ever manages to freeze something that would be lovely. ^.^