Master of the freak show
I'll admit Frustration is pretty useless in-game being as it's a pain in the *** to maintain 0 Happiness, but competitively it has a niche on Normal types and -ate ability users as a strong, reliable STAB that screws Ditto over if it doesn't set its happiness to 0.I hope that one day Frustration will no longer be a TM.
Not only it completely goes against the Pokemon concept as a whole (they're meant to have a bond with you, not hate you to the max), but also, it's only useful in an extremely specific situation.
And oh, Confide. That move was useless.