You don't need a stone. Fraxure evolves at Level. 48.
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You'll need to get a Fraxure or an Axew and evolve it into Haxorus. You can find Axew in Mistralton Cave and you can find Fraxure outside of Victory Road on some dirt and rocks.
You can evolve Murkrow into an Honchkrow, and Misdrevous into an Mismagius. That's all the Pokemon that evolve from a Dusk Stone.
Pikachu and Eevee both need a Thunder Stone to evolve.
pidgey doesn't evolve with a stone, it evolves by leveling it up.
Fraxure can't be evolved by any stones. You need to train it to level 48.