to get this cheev you need to activate the quest associated with room 237 at the hotel hub which you will reach during main questline.
the quest itself wont pop unless you travel to the very south of the map where there is a peninsula, at the very end of the peninsula is a hunter and runner you must defeat, once done, run over to the very end of the island and you will see 2 dead bodies of twins. this will activate the quest once you pick up the paperwork lying next to them.
travel back to the hotel, find room 237. enter (unlocking another cheev in process) which completes the quest ( I wont go into details but its a cool little side mission). head out of the hotel into the courtyard to find the maze on the right hand side. once you reach the center of the maze, travel straight ahead into the second part of the maze; FROM START> RLRLLLRRLR >FROM CENTRE>LRLL, this will take you to pauli which will unlock the cheev and a nice little easter egg
any questions please ask, don't just downvote.