The Poké Ball is a spherical device used by Pokémon Trainers to catch wild Pokémon and store them in the player's inventory when not active. Upon contact, the balls draw a Pokémon inside and then close automatically. Wild Pokémon are able to resist and break free; however, weakened Pokémon and those with status conditions are less able to struggle and therefore more easily caught. Legendary Pokemon are much more capable of resisting being caught, and will often require many Poké Balls or more powerful Poké Balls in order to catch them. If the player attempts to catch a non-player character's Pokémon, the opponent will block the Ball to prevent its theft.