The chance for Pokemon players in North America to grab two exclusive creatures will run for a very limited time later this month. Announced today for distribution via the Nintendo Network are Shiny Xerneas and Shiny Yveltal, the poster Pokemon for X and Y versions.

So far, this is the only way to get the color-swapped creatures in North America. The events run from May 11 to May 17 for shiny Xerneas and shiny Yveltal runs between May 20 and May 26. These Pokemon will be available in X, Y, Omega Ruby and Alpha Sapphire versions.