No training
Here's a way to get a strong rookie
1. train agumon/gabumon to 1000hp/mp and 100 off/def/spe/bra
2. battle and try and beat kunemon and palmon
3. DON'T sell or use the chips
4. when agumon/gabumon digivolves
train all stats 1000 more for hp/mp
and 100 more for others
5. beat as many bosses as you can
6. you should have about 10 chips
7. when digimon fades away use all chips on in-training digimon and train until he becomes rookie (focus on weaker stats)
8. you'll maybe have an ultimate depends on what chips you used
Have fun with your super-strong digimon!
We have more cheats and tips for this game here, Digimon World cheats
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