The Pokemon Company has announced how Xerneas and Yveltal will be distributed as part of the Year of Legendary Pokemon celebrations.

In the United States, players can collect a serial code from GameStop locations between May 4 to May 27, 2018. Pokemon Sun/Ultra Sun owners will receive Yveltal upon redeeming the code, while Pokemon Moon/Ultra Moon owners will be given Xerneas.

Check out the trailer for the distribution below. Here’s a list of upcoming distributions for 2018.