It´s on the compendium:
Psychic Restore (Uxie - Legends Awakened)
Q. If I use Uxie's "Psychic Restore" attack where it does 20 and puts itself into the deck, but Gengar's "Fainting Spell" Poke-POWER would knock out Uxie, what happens?
A. If you choose to put Uxie in the deck with Psychic Restore the attack completes first, and Gengar cannot return the knockout. However, if you do not put Uxie in the deck, then Gengar's Fainting Spell would Knock Out Uxie if the coin flip is heads. (Oct 30, 2008 PUI Rules Team)