After the battle ends the Pokemon will still evolve however you will have to revive it if you still want to use it.
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If Cresselia faints [same as any legendary pokemon] you cannot catch it ever unless you save before the battle and restart if you make a mistake.
No. Once a Pokemon faints you can't catch him. Sorry. No. Once a Pokemon faints you can't catch him. Sorry.
you should save before you battle it so if it faints you can turn off your game and battle it again
yes
Igglybuff do not evolve by level. They evolve by happiness, a rate of how much the Pokemon like their Trainers. Igglybuff can get happiness by leveling up, using an item on it, and challenging a Gym Leader. But be careful, if the Pokemon faints, or if you deposit it in the PC, the happiness will drop. I hope this will help you evolve Igglybuff. Trust me, when you evolve it, you are going to get a very cute surprise. Yea you get a jigglypuff. and you can also make it happy by walking it in the park! i think the igglybuff is cuter then the jigglypuff!