Pokemon X and Y players have been treated to a new Vivillon variant, to celebrate 100 million Pokemon trades in the Global Trade Station.

To get this new Fancy Pattern Vivillon, load up one of the games on your 3DS and pick 'Mystery Gift' from the main menu. Choose receive gift, open the communication channel, and hit 'connect via internet'.

After a little loading, you'll get the option to receive this posh new butterfly. Accept, and then back out of the Mystery Gift menu and load your save game.

Find a Pokemon Center and chat to the girl in blue to get this one-of-a-kind Vivillon for your party. The critter is level 12, and comes in a Cherish Ball. It has Gust, Light Screen, Struggle Bug, and Hold Hands as its moves.

You have until July 31st to grab this special Pokemon before it flutters off into the ether, never to be seen again. Probably.