In Pokémon Legends: Arceus, you can refer to the following for what the Thunder Stone can evolve in Pokémon Legends: Arceus:
Pokémon Legend: The Thunder Stone in Arceus can evolve Pikachu, Eevee, Magnemite, Northnose, Eel, Insect, and Lightbolt.
Use on Pikachu to evolve it into Raichu or Raichu (Alola's appearance).
Use it on Eevee to evolve it into Leib.
Use on a 3-in-1 Magnemite to evolve it into a self-destructing Magnemite.
Use it on the north-facing nose to evolve it into a large north-facing nose.
Use it on the Mamo Eel to evolve it into the Mamo Eel King.
Use it on the Insect Electric Treasure to evolve it into a Shovel Cannon Bug.
Use it on Lightpole to evolve it into an Electric Belly Frog.
