Union J will change their name to Union XY when Pokemon X and Y are released on 12 October. Union J's George Shelley suggested the name change and was involved in the design of the logo which will appear on the band's Twitter feed.
The band, who will be promoting Pokemon X and Y, announced the news at a press conference in London on Friday where they arrived dressed in Pikachu onesies.
Explaining the name change, George said: "We've always loved Pokemon and it was a massive part of our childhood, I'm hooked on it. "When I was telling the rest of the band how excited I was about playing Pokemon X and Pokemon Y, the idea to change our name just came to me. It's so cool to be a part of the game in some way; it feels like a natural fit."
They really are big Pokemon fans. Some members of the band got into Pokemon through the Trading Card game while Jaymi Hensley told ONM that his favourite Pokemon game is Pokemon Red, having played the first ever Pokemon game when he was young.