Read this info on [TR09] Thunder in Pokemon Sword Shield: Isle of Armor! Check out where to get it, & what Pokemon can learn Thunder!
Thunder Stats & Where To Get
|Description||A wicked thunderbolt is dropped on the target to inflict damage. This may also leave the target with paralysis.|
|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 Thunder
* Can be searched with Pokemon name.