Digimon World Re:Digitize Decode was just released on the 3DS in Japan. Originally, it appeared on the PSP as Digimon World Re:Digitize. If this is anything to go by, it might not be the best port.
According to Twitter user @eclair0427, the 3DS version has screen prompts for a "triangle button". The 3DS doesn't have a triangle button. The PSP does, though. Oh dear.
Kotaku hasn't had a chance to confirm this, so it should be treated as a rumour for the time being. And if true, it should be treated as poor porting!