"Uh... they're called Pokemon, and these are Pokeballs. It's where trainers store them when they're traveling around. Some of them are pretty big, so it's more convenient to carry them around like this. I don't really know how Pokeballs work beyond what you just saw... I guess I never really thought about it that much. Professor Oak probably could've told you, but he's been permanently droned."

[Dawn frowns for a moment at that as her Pokemon begin to have an animated discussion with Heph. Which probably just consists of a bunch of squawking, and Buneary and Pachirisu repeating portions of their names over and over.]