Ahh Digimon, 'Pokemon's lesser cousin'. As it approaches its 21st anniversary, Pokemon steams on at its 22nd. For years the digital monsters were shoved aside in the West for the pocket monsters, but now Digimon seems to be making a come back- thanks to Digimon Story: Cyber Sleuth namely.
Here, due to the probable small amount of fans, we can talk about any digimon game.
I've played Digimon World: Dusk and Digimon Linkz, while watching a playthrough of Cyber Sleuth.
Digimon Linkz is a pay-to-win/free to play phone game, not much to say about it. Story is very basic- the digital world is breaking down for some unknown reason and has been saved to your device for you to fix through digimon battles and other things. Its good for a few minutes of break time, however the need to pay comes up fairly quickly if you play for too long.. Quite sad, as this was my first time playing a 3D digimon game and it has tainted the series for me (but has been fixed upon my discovery of Cyber Sleuth). I would not openly recommend this unless you don't mind playing for short periods.
Digimon World: Dusk is a 2D RPG for the Nintendo DS. Dusk, and it's counterpart- Dawn, are considered to be the best games to introduce Digimon to Pokemon players. It tries to bring forth a larger story, however it falls flat with small plot holes, translation errors, and the fact that it references a previous game without explanation for players that didn't play the previous game. (I was legit confused on things for years before I discovered the other game and its story online)
Dusk and Dawn have connectivity, and require it for some digimon and quests. There was also a special 100% quest, however it is no longer accessible due to Nintendo shutting down DS Wifi connections- thus removing a quest and 2 special digimon from the game.
Despite these flaws, Dusk and Dawn can be quite enjoyable if you do not mind the fact that you will probably encounter a lot of grinding fests to reach digivolutions and higher stats (levels do not matter, the stats do). This game I do recommend, and I have played it 3-4 times (and replaying it right now).