The Rivals is an idea for the Trainer Editor, the rival would be added as a kind of "pokemon" so that they always have the stronger pokemon of the same gen/evo. So if the player chose charmander he'd fight with a squirtle but if another trainer had a grotle then the rival would have monferno. This means we can make balanced multiplayer in a linear game.
Other Better Tools for Map Makers Suggestions:
Like Game HMS:
http://pixelmonmod.com/viewtopic.php?f= ... HM#p186948
Multi Leveled Trainers:
Long Distance Battling: