How do you get a gibble in Pokemon SoulSilver?

You can't get a Gibble in Pokemon SoulSilver. Gibble was introduced in Generation IV (Pokemon Diamond, Pearl, and Platinum) and is not available in Generation II games like Pokemon SoulSilver.

If you're looking for a similar Pokemon in SoulSilver, you could consider:

* Trapinch: Trapinch is a Ground-type Pokemon that evolves into Vibrava and then Flygon, similar to how Gibble evolves into Gabite and then Garchomp.

* Gible: If you are playing Pokemon SoulSilver, you can actually get a Gibble by trading with a player who has a copy of Pokemon Diamond or Pearl.

Let me know if you'd like to know more about any of these Pokemon!