Yeah, there is a Shadow Lugia. It's a Promo Card, released in the same set as Ancient Mew and Articuno.
"What can this strange device be? When I touch it, it gives forth a sound
It's got wires that vibrate, and give music; what can this thing be that I've found?
See how it sings like a sad heart, and joyously screams out its pain
Sounds that build high like a mountain, and notes that fall gently like rain."