delete yo-kai watch, and follow this person's tutorial: once you enter the eshop, search up yokai watch and hit "take me to the redownload screen" :) hopefully this helps!
I went to a garage sell last saturday, and the lady had a PS2 for sale, but she had a sign on it that said "Nintendo -$50", had to laugh, almost bought but she didn't know if worked, and she didn't have controller or cables, so I passed.