I got to thinking about what the fuck UB:Assembly could be based on as that may give hints toward it's type. Clearly it's a brick wall, but it may be related to the Japanese Yo-Kai Nurikabe. For those that don't know, Nurikabe is a wall that blocks the paths of travelers at night(possibly the reason it's exclusive to Ultra Moon). With this information in mind we can assume that it could be a ghost type, as for a second type, I have no clue. Sometimes Nurikabe is depicted as a brick wall, other times it's a dog, sometimes it's this little blob fellow in the image. That leads me to three different results. 1: Normal/Ghost(dog Pokemon are typically normal types right?)

2: Rock/Ghost

3: Pure Ghost
Also speculation thread.