It's got nice coverage I guess. But remember that it's locked into one move and it's probably going to be abusing it's STAB, as Hammer Arm leaves it susceptible to Revenge-Killing and Thunder Punch isn't all too powerful, not to mention it lacks super coverage. Things like Heatran, Skarmory, Forretress, Ferrothorn, Keldeo, Landorus, Thundurus-T, Politoed, Gyarados and so many other things can use the locked CB Metagross as set-up fodder which is super deadly for any team.
And it's nice to know that AgiliGross can reliably deal with Fighting Types but uh... I don't think that's big enough to outclass some other Pokemon. Honestly, AgiliGross should only be used when you can't afford to compound certain weaknesses or you need it's Steel Typing for some defensive coverage. Honestly if you want a sweeper to deal with Fighting Types check out Special RP Landorus. This guy resists Close Combat and Focus Blast and can afford to use Psychic if you really must, though his Earth Power should be more than enough along with HP Ice.