I guess I was too young to get the mechanics right.
I dreamed of getting like Greymon/Meramon (just 2 examples), then getting some of the pro-ultimates, but I never really managed to get lucky.
I did manage to get some ultimates, like Vademon (the flying saucer), Metalgreymon (a few times, probably my most pro), Monzeamon (not sure about the spelling, but the bear by using Numemon + the suit), also got Andromon, Giromon, and Metalmamemon OR Mamemon. (not sure)
Sadly it felt like I spent all the time at the gym to get a pro Digimon, then whenever I got lucky and got (lets say an Ultimate), I only had 1 or 2 ingame-days to do story-stuff, before they died.