Normal: A less bulky Mewtwo. It may be useful if Psycho Boost gets a buff or it is easier for some players to get.
Attack: way too glassy to be useful.
Defense: with only 100 Hp, it's still less bulky than Lugia and Latias. In TDO, it will even lag Metagross.
Speed: Unlikely to outperform Gardevior, Metagross, or Exeggcutor.
In summary: Only the normal form has a chance to be useful; but if you are stacked with Mewtwo, probably not.