Flashfire is the second main expansion in the XY Series of the Pokemon Trading Card Game. The set continues to feature EX cards, Mega Evolution and the Pokemon of Gen VI.
The set contains a total of 109 cards comprising 106 in the main set and 3 secret rare cards, an astonishing 7 of which were Charizard or M Charizard who is the sets main focus and Mega Evolves into both M Charizard X and M Charizard Y.
The Japanese version of the set was called Wild Blaze and released in Japan on March 15th, 2014, the English release followed on May 7th, 2014.
Official set description
Reign with Fire!
Blaze your way to glory and watch the sparks fly when you play the Pokémon TCG: XY—Flashfire! Ignite the action with a firestorm of Fire types and watch your opponents' terrified double-take as the awesome Mega Charizard-EX makes its scorching debut in this breathtaking expansion! Your explosive adventures will continue as your foes flee the field with certain doom flashing before their eyes!