The 100% guide says I have to go find him at night in the Odd House, but it seems like the Odd House has been replaced by the Lost Castle in the newer versions of the game. Is there still a way to battle Spector?
To do it currently, you have to accept them, choose if you want to give a nickname, open your party and scroll down to them. Is there a mod that makes it quicker (maybe like with eggs where you see a preview of them as soon as they hatch)?