Pretty useless:
The body only affects Stage 2 ex's so it's far too narrow to be useful, and most (95%) stage 2 ex's won't need the 10 damage boost at all. Put it in the other way: its body doesn't benefit itself at all, so it's only any good as a supporter of the team.
The only attack is too weak to be a main force and requires a coin flip to induce confusion.
Its weakness to Psy is OMGWTFBBQ, because the only type weak to Dark is Psychic. I can't see why as a D type it doesn't have a resistance to P but a weakness to it. Also it doesn't have the resistance to F as it should (it's a bird after all!).
So, the only use of this I can see is, if you can afford to waste 8 cards, to have 4 of these on your bench and a stage 2 ex that does 80 base damage like Gardevoir ex, so it can now 1HKO any non-ex. But it's just for a LOL...
4/10