Nov 3, 2016, 10:42 AM
(This post was last modified: Nov 3, 2016, 10:42 AM by Excalibur0126.)
If your game is over when your "solo" Pokemon faints, it defeats the purpose of catching a Pokemon on each route aside from HM slaves. Also, I believe you could just faint Xerneas instead of catching it.
The minute you think of giving up, think of the reason why you held on so long.