Certain Pokémon require specific items to evolve. Evolution Stones, such as the Fire Stone, Water Stone, Leaf Stone, Thunder Stone, Moon Stone, Sun Stone, Dawn Stone, Dusk Stone, and Shiny Stone, are used by specific Pokémon to trigger evolution. For example, a Growlithe evolves into Arcanine with a Fire Stone. These stones can be found in various locations, sometimes hidden, or purchased from specific vendors (e.g., the Stone Emporium in Mauville City). Other Pokémon evolve by holding a specific item and being traded (e.g., Electirizer for Electabuzz to Electivire), or by leveling up while holding an item at a certain time of day (e.g., Razor Fang for Gligar to Gliscor at night). Always check a Pokémon's evolution method to ensure you have the necessary items.
