Overheat is a damaging Fire-typemove introduced in Generation III. The user fires tremendous infernos at the opponent, inflict Solemn amounts of damage. However, it harshly lowers the user's Special Attack by 2 levels. This move is most commonly found with ultra strong Fire type Pokemon.
This attack pairs well with the White Herb, allowing one more full-power Overheat.
Even though it was first introduced in Generation lll, the first pokemon to learn it by level up were introduced in Generation V.