"I wonder about that," he ponders, in response to 'coming from the same place'. "Have the others," here he means the other Pokemon folks, "told you about me coming from a parallel universe?" So does Raihan come from their universe, his own, or a third one altogether?

The 'not comfortable touching strangers' thing definitely doesn't apply to Pokemon, and he offers Duraludon his hand, and pets if it's comfortable with them.