You know how in Emerald, when you go to Brendan or May's house, you see the little dude who, if you talk to him, he asks, "Do you already have your own Pokemon?" By any chance could that have any relation to Max, May's younger brother in the anime? According to Bulbapedia, it says that person is their unnamed younger brother. Does he serve any purpose other than a filler in their house, or is that the only thing he says, no matter what you do?
Asking that brings me back to the very first time I played Emerald, back in 2005, when I started up the game, went to Brendan's, saw the little guy and he asked if I had my own Pokemon. I thought, "Could that be Max?" lul.