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I just realized I made a mistake on my reply, I was trying to say that if you fill the game with every idea you have, it might take the logical sequence of the plot away. Sorry, I was typing to fast xD
I actually have an idea that you might like. You may put battles where you have to ally with your rival to win, for example double battles where you and your rival have to face a tougth leader, who knows. My opinion is that you have a lot to work with this hack, your limit is your imagination...