In the games

Pokémon Rumble

In Pokémon Rumble, Wonder Keys are keys that bring Toy Pokémon to life. The player has 3 Wonder Keys in a course. If the player's Pokémon faints, he or she will lose a Wonder Key. However, if the player switches a Pokémon that has not fainted, the player does not lose a Wonder Key. Also, if playing multiplayer mode, the onder Keys count for all of the players. Once any player has a Pokémon that is knocked out when there is 1 wonder key left, the player(s) fail to complete the course.

Pokémon Rumble Blast

Wonder keys have the same function in Pokémon Rumble Blast, but there isn't any multiplayer mode.