Every evolution stone in Pokemon Scarlet & Violet is important, but the Thunder Stone is arguably the most important of all. The item is used to evolve five different Pokemon, including both fan favorites and fun newcomers. All the familiar evolution stones from past titles can be found in Pokemon Scarlet & Violet. But while some are used on as few as one Pokemon, players will need several Thunder Stones to complete the Pokedex. Heres where to get them and which Pokemon to use them on.