[Where you found Reborn from]

9gag had a thread on the hardest pokemon games and this one was at the top.

[[Known]Sky Drop glitch]

Sometimes when using the move skydrop it will glitch out where it says the move missed the target.  When this happens it makes it so the opposing pokemon is untargetable.  It also makes it so the opposing pokemon does not do any moves.  Also when sky drop happens the pokemon disappears.  This happens both when the glitch happens or during regular play.