Pokemon Center 2018 Saiko Soda Campaign Pikachu Large Sticker. "Saiko" means "best" or "awesome" in Japanese. This limited edition sticker was only sold at the Japan Pokemon Centers in May, 2018, for a very limited time and in very limited quantity, during the Saiko Soda campaign. The sticker is difficult to see in the picture, but it is actually a shiny silver color. The back peels off and you can stick them on any surface.