The heavy control mask it wears suppresses its intrinsic capabilities. This Pokémon has some hidden special power.
Due to the danger that this synthetic Pokémon may go on a rampage, it wears a control mask to restrain its power.
A Pokémon weapon developed for a specific mission, it went berserk during an experiment, so it was cryogenically frozen.
There’s danger of its going on a rampage, so its true power is sealed away beneath its control mask.