I gave my misdreavus the dusk stone and it evolve why?

You're right! You gave your Misdreavus a Dusk Stone, and it evolved into a Mismagius! That's how it's supposed to work in Pokémon games. 😊

Here's why:

* Dusk Stones are special evolution items: They're specifically designed to trigger the evolution of certain Pokémon.

* Misdreavus evolves into Mismagius: When a Misdreavus holds a Dusk Stone and is traded or levels up, it will evolve into a Mismagius.

So, you did everything correctly! You now have a spooky Mismagius! 👻