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When the wielder is at 1/3 HP or less, all of its Fire-type moves will have 50% more power.
Blaze is usually exclusive only to the Fire-type starter Pokemon, and is their only ability. However, the advent of Dream World has brought some more usable options, such as Blaziken's Speed Boost, or Emboar's Reckless. However, there are times when Blaze can be effective. Whereas the high prevalence of priority attacks and sandstorm has made it a less effective option, using Substitute to bring a Pokemon's HP into the range of Blaze and a pinch Berry was an option at one point (most notably for Belly Drum Charizard). Nowadays, however, Blaze is simply a last-ditch attempt to deal some damage before the Pokemon goes down.
Found in Dream World