Question

I was playing my pokemon diamond on my R4(and it was Japanese).
Then I went to the place where you can battle in double battles and I sent out a pokemon and a hoothoot I beat a few of my opponents pokemon and my hoothoot leveled up.Then my hoothoot got defeated.After I won the battle my hoothoot evolved!

So in short:is it possible to evolve when your pokemon is fainted?

Answer 1

Yes. As long as the pokemon meets all its prerequisites for evolving, it will evolve, regardless of status or if it is currently fainted.