It appears that PKHeX's block data editor does, in fact, use elements from previous Generation 3 games to make editing easier and more consistent. Since the coupon titles and associated features were originally made for Colosseum and R/S, they might not work in Emerald. If the flags are still set to "false" after reaching the coupon threshold, that means they aren't being used in Emerald. It's probably just a technique to centralise all editable data in PKHeX, away from Emerald's gameplay.
geometry lite