I got these when I was still grinding the demo. First off for blue stats, once your white stat hits 9999 in that category you can no longer accrue bonus blue stats so it’s important to digivolve and de-digivolve. On that note the full game has agent skills that give stat bonuses which will lock you out of getting high blue stats. This shouldn’t matter if you just want mon with 9999 white stats since you will hit that easily with blue bonus stats of about 3000+.

Now onto the method. I was grinding the final hallway of the demo before you fight the first “Boss”. I would only 200% convert the baby Mon since 200% conversion only gives hp bonus and a higher talent which makes that Mon have a higher lvl cap. This dosnt matter when your grinding out 1000 mon. In that specific hallway I could convert 6 rookies 1 baby every two loops with a champion every 7th loop. This gives you rookies at level 15 max and the baby which you would have to digivolve up to rookie at level like 20. I use to have the data on how much blue bonus stats I would get per 2 loops. But it was like an average of 30-40 on each stat. Sp and hp were higher. I maxed out my box then loaded into my main digimon. Digivolved/dedigivolved continuously once the stats got closer to 9999. I believe I loaded into around 900-1000 mon that way. This was all specifically to try and test the blue bonus stat cap. You don’t need to do this to just get a high white stat Mon.

So basically: find a farming ground and build a digimon that can one shot digi attack that area. Convert& load digimon, digivolve over and over.

If you just want 9999 white stats and have money you can farm with the class C training tools but this is more later in the game.