Unfezant has different forms depending on its gender
This bug is more visual than other thing to be honest

If a Tranquill evolves into Unfezant its sprite will default male, but Unfezant can be female with its sprite being the male sprite.

Image: https://cdn.discordapp.com/attachments/ ... nknown.png

I'm unsure if this happens with other pokémon, at least it worked for my Meowstic.
No, puting it back in the PC won't update the sprite.