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I don't see the problem with branching evolution paths. For a pokemon game with digimon instead you can easily do it, Just make the story similar to the anime with some nutjob digimon trying to take over the world and you have 6 tamers who each have a baby digimon, Who digivolve into different digimon depending on the circumstances. I.e Koromon can digivolve into Agumon if it reaches level 10 while it can also digivolve into Commandramon if it battles 20 times. It can evolve into Chuumon if it levels up while poisoned. Then you can apply this to all the 6 partner baby digimon.