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Digimon/Pokemon crossover.
Story: The Pokemon Storage System suddenly becomes corrupted by a virus and you're sent to the computer network inside to find the problem. In the Digital World, you meet a Digimon tamer who joins you on your quest.
You can't catch Pokemon, but for every PC Box you liberate from the virus, you can "rent" Pokemon inside to aid you. The further you progress, the better Pokemon selection you get to choose from. The Digimon tamer can track Digimon trying to sneak into the network, catch them, and train them for battle.