The Pokemon Company and 7-Eleven have teamed up for a promotion involving Pokemon and ice-cream.

From December 18, 2017, customers who purchase two pieces of eligible Meiji and/or Akagi brand ice-cream are entitled to receive one of four Pokemon clear files of their choice and a serial code to redeem Casteliacone (an item that looks like ice cream) in Pokemon Ultra Sun and Ultra Moon.

Each 7-Eleven store will have 32 clear files so you probably have to act fast.

Here’s a look at the ice-cream which are eligible for the campaign.