2 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

Can I use this card's effect to only choose 1 of my opponent's Digimon?
No. Choose as many Digimon as you can. The only time you can choose 1 Digimon is when your opponent only has 1 Digimon in play.
Ruled Mar 28, 2024
Can I use this card's effect to give 1 Digimon -6000 DP?
No, you cannot.
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