It's normal for a game to take a few seconds to load after you launch it. However, if you only see a black screen for more than 2 minutes, our video guide will help you fix the problem:
This error occurs primarily on the 3DS, 3DS XL, or 2DS if it was originally a Japanese console and a region change has been performed. Particularly large games can then cause the console to freeze and only display a black screen.