Read this info on [TR20] Substitute in Pokemon Sword Shield: Isle of Armor! Check out where to get it, and what Pokemon can learn Substitute!
Substitute Stats & Where To Get
|Description||The user creates a substitute for itself using some of its HP. The substitute serves as the user's decoy.|
|How To Get||Raid Battle Reward: Rare Drops from raid bosses that is the same type with the move type.|
(Exceptions exist based on Area and Den)
Pokemon That Can Learn Substitute
* Can be searched with Pokemon name.