If you want your Digimon to obey you have to keep it's discipline bar even with the happy meter.It might not obey you but it will win lot's of battle's.
If you want a good Digimon,then press X and square while it's Digivolving.
My cousin got a Tyrannomon that way.His name is Rock.If You want an evil digimon don't press anything while it's Digivolving,And make sure it's virus meter is halfway.
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