The surname matches, then. Meeting another world's Gold... Well, if that happened, Gold hasn't told Red about it at least. The Pokeball drawing has Red confused for a moment. A Togepi, that matches. This style? Of what? Oh... The Pokeball? Now that he thinks about it, Red saw Pokeballs that weren't translucent earlier. So the Pokeballs in other worlds were like that?

Red takes out one of his own Pokeballs and shows it to Alice. A Charizard is visible inside, waving at Alice.

"...It's unusual?" he asks, referring to the Pokeball style. If it is, then maybe this Gold really is the Gold he knows. The first name and surname match, and at least one of his Pokemon, so... it's starting to seem more and more likely.