I've been trying for days but it keeps using self-destruct. I've been thinking of skill swapping damp on it but no Pokemon have damp and skill swap. Pls help me =(
Damp prevents all Pokémon from using Self-Destruct, Explosion, Mind Blown, and Misty Explosion; if a Pokémon attempts to use one of these moves, it will fail and the user will not faint or take damage. Additionally, Damp prevents the Ability Aftermath from doing damage when the Pokémon with Aftermath faints.
Source
You don't have to Skill Swap Damp onto it, so don't worry about that.
I recommend Quagsire (available in Ultra Wormholes) if you'd like to use a Pokemon with Damp to help SOS chain, and honestly, that sounds like a pretty good strategy.
Hope this helps! :)