I have this card with [Belphemon] in its digivolution cards. After deleting all of my opponent's Digimon with the highest level for this card's [When Digivolving] effect, can I choose to not have this Digimon attack?
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Official Ruling
No, you can't. You must process as much of this card's [When Evolving] effect as possible.
Source: BT23-070 Belphemon (X Antibody)