Uxie

Uxie is a generation IV legendary Pokemon. It can appear in the background of the stage Spear Pillar, but has no effect on the battle.

http://img519.imageshack.us/img519/3950/480kt7.jpg

Can be seen at (1:50) of this video

References

1. http://bulbapedia.bulbagarden.net/wiki/Uxie_(Pok%C3%A9mon)

2. http://youtube.com/watch?v=TiRG9VY9JdE&feature=related