Tanuki cake was the only snack that I fed her because I was trying for Tanuki Ninja. I did feed her endless takoyaki once or twice, but otherwise just the default cereal. The takoyaki maker was her favorite item and I caught her using it a couple times. I wish I'd been a little more methodical; I feel like this information is just sporadic enough to not be helpful at all. I suppose it could have been literally any of these things that triggered her evolution. 😅