According to a listing, the Pikachu version of the Wii U Pokken Pro Pad Pikachu Controller is exclusive to GameStop in the North American region.
For the uninformed, the new iteration features the colors and logos of the popular mascot from the Pokemon franchise. The pad, which has a normal version (you can check it out with this link on Amazon), is officially licensed by Nintendo for use with Pokken Tournament. You can check out the product description for the dedicated gamepad below:
Officially licensed by Nintendo and Pokemon Wired USB controller exclusively designed for Pokkén Tournament Ergonomic design and button layout optimized for Pokkén Tournament Does not include Pokkén Tournament software Enjoy authentic arcade action at home! Designed by HORI, the same designers of the official Pokkén Tournament arcade cabinet controller, the Pokkén Tournament Pro Pad is designed exclusively for use with Pokkén Tournament for the Wii U. This is a limited edition Pikachu version featuring Pikachu colors and designs. This wired USB pad is ergonomic, comfortable, and super effective for controlling your favorite Pokémon in Pokkén Tournament battles. USB wired connection is tournament legal and completely lag-free. *Note that due to software design player one must use the Wii U GamePad for local battles.
The Wii U Pokken Pro Pad Pikachu Controller will be made available on the 7th of May in the North American region.