"There's quite a few things from home that would be useful in this world." Like supplies and equipment. He looks up suddenly, as if startled.

"We are considering this place another world, right? My illusion idea doesn't make as much sense anymore, since so many people here have never even heard of Pokemon."

While a Pokemon, or group of Pokemon, with sufficient power would be capable of an illusion this, he can't understand why they would leave some people with their memories of Pokemon and not others. The idea that these people genuinely came from worlds without Pokemon, as strange as that sounds, makes more sense to him.