Leak

A leak is some of information about a game that has been released prematurely. One of the most famous leaks was the Ness, Lucario, and Jigglypuff leak. In a japanese how to play video, they were confirmed.A week or two before the game launched in Japan, Nintendo's Japanese website posted an introductory video of stickers and other features. At around 4:21 in the video, different stickers are shown and what appears in the bottom part of the screen is the head of characters that could equip the sticker. Ness is next to Lucas, and Jigglypuff and Lucario appear next to Pikachu and Pokemon Trainer when their stickers are highlighted.