>>20421001The worst mega is objectively Abomasnow. It has one of the worst defensive typings in the game, low as fuck speed, and mixed offenses/defenses which means it can only be run on TR. Banette is also fucked up by design as a worse Sableye, but it at least can sort of do things after it mega evolves and Prankster starts working.
Absol is strictly a worse Honchkrow, but that doesn't make it bad. It just means Honchkrow is really fucking good.