In Gen 3, the Pokemon series made the jump to the Game Boy Advance, and with this generation came a variety of new critters and mechanics for players to experience. Players could now participate in Double Battles, which would become the standard format for competitive Pokemon VGC battles, and every monster now had an Ability, which added another layer of complexity to battles. For players looking to complete the Gen 3 games as efficiently as possible, there are a few key critters they will want to include on their team.