Is it normal for Pokemon to evolve when fainted?

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?

Comments

If you're reading this in the future, Pokemon won't evolve if they leveled up in a battle and then its trainer lost that battle.

Answer 1

It depends on the Pokemon. According to Bulbapedia:

However, it can still evolve after battle if the required criteria were met (unless the player blacks out, if the Pokémon evolves by leveling up, or is Galarian Farfetch'd)...

Answer 2

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