pokemon x and y flashfire booster box XY Pack EX in the Charizard Pokemon TCG: X & Y

For completeness' sake, here's the list of Mega Dimension megas from the December DLC, which haven't yet gotten a card

Once per turn: You can detach up to 2 Xyz materials from this card, then activate only one of the following effects depending on how many materials were detached: 1: Attach 1 "HERO" Monster from your deck to this card as an Xyz Material

One very special Collector booster is going to have a one-off, unique version of the card, complete with a serial number of 1/1

The card draws a lot of style from the animated film, and even features the trumpet-playing alligator, Louis, in the background, leading the band with his jazzy tunes