I know how to fix that. Lets say your team was Charizard, Blastoise, Venusaur, Feraligatr, Meganium, and Typhlosion. You could just go to the first field, and hack it so all the wild pokemon are Charmanders. Catch one, then make it so all wild pokemon are Squirtles. Do that for all 6, turn off the hacks, and you're good.