He lives in a remote shack in the forest, while frequently being visited by the Harbinger Misty. As told in his backstory, that is where the scientist that created him stayed to conduct his sick experiments and thus he decided to stay as it is technically where he was born. He was also instructed by Misty to never interact with humans in this realm as they would undoubtably call him a monster and try to kill him so he only interacted with animals in the forest or other Harbingers Misty would bring around, all of them talking of how their contractors go on grand adventures and enticing Ren to join once he is older.