Go to the player in the inventory list (where it has the face of the person is) then go to your cards pick any of the card if you have any then press triangle and x repidedly but fast.
Then the picture that you chose should be stuck to your screen, then get out of the card list then go to the chart where it shows you what the didgimon can digivolve into.
Then choose a digimon on the chart and press left or right then the chart will show you what kind of didgimon it can digivolve into.
More tricks, tips and cheats for this game are right here - Digimon World cheats
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