Hi, When you use a Revival Herb in a fainted pokemon, In the chat it appears as if it had revived it with 50% his life.
Proof:
[bbvideo=560,315]https://www.youtube.com/watch?v=SrLvjX64rUo[/bbvideo]
Hey marcus, he will appear again but you will have to follow the Celebi Quest!, when you are doing those steps you will have battle him. :Shy:
I hope it works for you.