Where do you get stone edge in soul silver?

You can't actually get the move Stone Edge in Pokémon SoulSilver. It was introduced in Generation IV (Pokémon Diamond & Pearl) and therefore not available in Generation II games like SoulSilver.

However, there are a few strong Rock-type moves you can teach your Pokémon in SoulSilver:

* Rock Slide: Learned by many Rock-type Pokémon via level up or TM.

* Rock Tomb: Learned by many Rock-type Pokémon via level up.

* Ancient Power: Learned by many Rock-type Pokémon via level up.

* Rock Throw: Learned by many Rock-type Pokémon via level up.

* Rock Blast: Learned by Omanyte, Omastar, and others via level up.

Remember, you can also use the Move Tutor to teach some Rock-type moves to certain Pokémon, though the selection is limited.