Brendan & May
Your rivals in Pokemon Ruby and Sapphire take on a different approach. For the first time ever your primary rival is the character opposite to your gender: May if you're a boy and Brendan if you're a girl. They are the child of Professor Birch and aid him in his research. They also appear more friendly than rivals of past games. As well, unlike previous games they don't make it as far with their teams as you and you don't get to see the final evolution of their starting Pokemon. The first time you meet the rival is after you move in, as asked by your mother..