Poké is the money found in Pokémon Mystery Dungeon games. Poké can be found in dungeons or be given as rewards for completing missions. Poké can be stored in the Felicity Bank in Mystery Dungeon 1 and the Duskull Bank in Mystery Dungeon 2 and 3. Fainting in a dungeon will result in losing all money not stored in the bank, or only half of the Poké in Mystery Dungeon 3. You can spend it on important stuff.