I don't think so Quasar, I think it's when Raichu and the group get to certain points and their characters have to go against/team up with some randoms to continue the story or something, like a side story or a small detour like the ones in the actual show. We're like those trainers who come out of nowhere but only when its near the group or has something to do with them going wherever they need to go.
Oh oh, we're like those guys who verse them in those tournaments where we're only in like an episode or something. Something along the lines of that I think.