The first Digimon game I remember playing was Digimon World 4, and the second one was Digimon World: Data Squad. I remember playing as Dorumon in the former game, and not getting that far in the latter game, though I saw my brother get way further into the game than me.
Digimon world foe the ps1. Never really understood how to actually play it as intended as a kid but I would use a hameshark to cheat in the digivolution items and just play around with the different mons