There's not much in terms of recent games, though there is a free one on Ipad.
Otherwise the good ones come from the PS1 Era with Digimon World, Digimon World 3000, Digimon Rumble Arena. Seek out emulation for those if you wish.
There's also PS2 Digimon Rumble Arena 2 and Digimon World 4 although rare, probably expensive and not so great.
For DS, 3DS, Wii and PSP theres: -
Digimon World DS (Japan, North America only)
Digimon World Dawn or Digimon World Dusk for DS (Japan, North America only)
Digimon World Championship for DS (Japan, North America, South Korea only)
Digimon Story Lost Evolution for DS (Japan Only)
Digimon Story: Super Xros Wars Red and Blue for DS (Japan Only)
Digimon World Re:Digitize for PSP (Japan Only)
Digimon Adventure for PSP (Japan Only)
Digimon World Re:Digitize Decode for 3DS (Japan Only)
Many of these are perhaps not easy to obtain or not cheap. Most of Digimon games haven't released outside of Japan since after season 3 or 4 properly as it seems.
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"When you begin to realize your own existence and break out of the social norm, then others know you have completely lost your mind." -PerfectlyDarkTails
AS 168/200, NT: 20/ 200, AQ=45 EQ=15, SQ=78, IQ=135