Applegate to leave (by siding with Carla over the basketball) and then head out to the Playground. Celestial Slug (Card #1): After you’ve destroyed Monty’s wheelchair during “ The Hitman’s Potty Guard” mission choose to go to Gym Class.These cards are broken up into different colors (with 10 of each color): Blue, Red, Green, Yellow, and Purple. There are a total of 50 Monstermon cards to collect. Beating the game (by completing the Creature Feature mission) unlocks a guide to all Monstermon locations.You can start battling at Recess and Study Hall once you have 10 cards in your collection. A number of cards require winning battles against your fellow students.Once a Monstermon card is collected it is added to your collection there is no need to finish out the day.Collect all 50 cards for the Gotta Get ’em All! and What Did it Cost? achievements.