First complete week 7's first Deadpool challenge to unlock this second challenge. Then go into an Elimination match on the map and find a Phone Booth at The Grotto jump into the trash bin in front of the satellite silo to be transported to the red phone booth. Or find a Portapotty at The Grotto jump into the satellite silo to get some upwards wind to fly to the lake-side town nearby, where you'll find a speedboat that you can take with you on land due North until you see the blue Portapotty. In either spot you can go inside to disguise your character. If you completed all week 1 through 7 challenges, you've now unlocked the Deadpool skin!