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

This card's <When Attacking> effect refers to "your opponent's Digimon with the highest DP." Does this strictly refer to my opponent's Digimon with the highest DP, or does it refer to when I attack an opponent's Digimon with the highest DP out of all Digimon in play, including my own?
It refers strictly to your opponent's Digimon with the highest DP they control. The effect doesn't check the DP of your Digimon.
Ruled Mar 28, 2024
My opponent has multiple Digimon tied for highest DP. If I attack any one of them, does this card's <When Attacking> effect let me unsuspend this Digimon?
Yes. If your opponent has multiple Digimon tied for highest DP, attacking any of them allows you to unsuspend this Digimon.
Ruled Mar 28, 2024
My opponent's Digimon with the highest DP is unsuspended. If I attack their unsuspended Digimon with the highest DP, can I unsuspend this Digimon?
No, this Digimon's <When Attacking> effect only lets you unsuspend this Digimon when attacking your opponent's Digimon with the highest DP, regardless of whether it's suspended or not.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.