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The dev can also add additional way to refresh the "specific" challenge such as do that challenge for 50 times, and the specific challenge will change when you want to do it for the 51 times. So you won't get bored doing the same challenge for eternity. 

This is just an example.

This is the proof that it's not impossible. You can count it as the ultimate challenge to really challenge your digimon. 

I genuinely hope that the dev will add more of this kind of challenges or maybe add "Nightmare Battle Mode" where you can't do 1 hit kill anymore and have to use items properly in future update so the game wont get boring easily. Also, with that kind of challenge, you will have a reason as why you have to grind your digimon stats to the cap.

Also, the new mode should pay attention to digimon type, so when you use the right type to battle, you can get significant boost damage ( for example, without using any items 3 damage will become 6 damage if you use the right type of digimon. And with using items that 3 damage become 4k damage, while with the right type of digimon 6 damage become 7k damage). 

Eventho your digimon still will never do the 1 hit kill in that battle, but at least the right type give you more advantage to win the battle so this will become more reasons for player to raise more digimon from other types.

You need to use items properly to complete that challenge, specifically the atk buff item and the defensive shield item. 

It's not impossible as long as you cap atk, def, and sp.atk. Also have at least 25k hp.

Also, you have to add an effect to your attack such as frozen effect from special item.

The dev don't need to refresh all the challenge, at least the specific challenge will change after ppl do it for 50 times (20x, 30x etc also good too) so ppl can't abuse it.

I would suggest to add another refresh method to the challenge list. Maybe add "100 challenge" to refresh the challenge list or else it's kind of cheating, abusing the infinite good challenge to farm bits etc.