Picrites are a form of currency introduced in the game. Every time a puzzle is completed, its corresponding Pokémon is captured and can be used in subsequent puzzles to provide special powers, including automatically fixing the first few mistakes the player makes, revealing several squares when the puzzle starts, and hinting at which row to work on next.
The usual rules of picross apply, but are also supplemented by the special abilities of the Pokémon available within this game. This entry in Nintendo's Picross series has players solve the eponymous puzzles, also called nonograms, to form an image of an object or creature from the Pokémon universe.