Mega Evolutions are a special transformation that certain Pokémon can undergo during battles. This process enhances a Pokémon's abilities, stats, and sometimes even changes its appearance. To initiate a Mega Evolution, a trainer must use a specific item called a Mega Stone that corresponds to the Pokémon. Not all Pokémon can Mega Evolve; only select species have this capability. Each Pokémon that can Mega Evolve has a unique form, often with improved strengths and new abilities. This feature was first introduced in the Pokémon X and Y games, adding a strategic layer to battles and team-building.