Slim

Slim is the fourth of the many  Pixls  that  Mario ,  Peach ,  Bowser, and  Luigi  discover in   Super Paper Mario. He joins the party at  Merlee's Mansion. His special ability is to allow Mario to become very thin (in a manner very similar to the Paper Mode curse of  the previous game ), letting him have access to previously inaccessible areas. An example of this would be if he wanted to get between two rails. Also, if the player stands still using his ability, the player will become invisible and untouchable by enemies, making Slim quite useful in boss battles.

Catch Card Location
Brought from the Card Shop or Found in Room 40 of the Flipside Pit Of 100 Trials.