3 official rulings from Bandai, last ruled Jan 24, 2025. Straight answers to how this card actually resolves.

Can I not attack with this card after this card's [On Play] [When Digivolving] effect grants "Penetrating" and DP+4000 to one of my Digimon?
Yes, it is possible.
Ruled Jan 24, 2025
With the [When Digivolving] effect of "BT16-077 Dinobeamon", I played this card [On Play] and attacked a player with "BT16-077 Dinobeamon" with "Quick Attack" as it is. After that, can I attack with this card by its [On Play] [When Digivolving] effect?
No, you cannot attack. While attacking, you cannot declare a new attack. In this situation, you can attack with "BT16-077 Dino Beamon" under the [When Digivolving] effect of "BT16-077 Dino Beamon". Before the Counter timing, the card's [On Play] and [When Digivolving] effects can be activated, but you cannot declare an attack during the attack, so you cannot attack even if you activate it.
Ruled Jan 24, 2025
If this card's [All Turns] effect is activated and two Digimon including the leaving Digimon digivolve, does the digivolved Digimon leave the Battle Area?
No, they do not leave the Battle Area. DNA digivolves digivolve as a new Digimon, so it is a different Digimon than the one that leaves.
Ruled Jan 24, 2025
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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.