Blaze

Blaze (Japanese: もうか Raging Flames) is a fire type ability introduced in Generation III naturally exclusive to -type Starter Pokémon.

Generation III
Ups FIRE moves in a pinch.

Generation IV & V
Powers up Fire-type moves in a pinch.

Generation VI
Powers up Fire-type moves when the Pokémon is in trouble.

Effect
It increases the power of fire moves by 1.5x when the Pokémon is at 1/3 or less of it's health.