Looks like we really showed Magma and Aqua who's boss, or at least we chased them off for the time being. No RFR for these rewards as it wasn't a main RP, but everyone who participated gets:

10 Snag Coins
10 Gengar Tokens
1 Held Item of their choice (If you want to flavor this up a bit you can have it be a gift from one of the fan letters to your character. Excludes mega stones obv.)

Also any Pokemon that battled that can evolve or needs purification gets ten purification/evo points.