In Pokémon XD: Gale of Darkness, a Munchlax was featured in the game, as somewhat of an easter egg. Occasionally, a Munchlax will start eating the Poké Food placed on the Poké Spots. The very instant the player finds Munchlax, its trainer will appear, and apologize to the player, giving him the amount of Poké Food that Munchlax ate, as well as a random Herb. This happens constantly throughout the game.
Munchlax will also appear as a Poké BallPokémon in Super Smash Bros. Brawl. When released from the Poké Ball, it will walk around the stage, eating any item it gets its hands on. Doing this stops other players from collecting the item themselves, which they could have used to attack the opponent. The biggest concern, is if Munchlax eats a very important item, such as the Smash Ball, which allows the player who collects it to use the Final Smash.