This Digimon attacked the opponent player and was blocked by an opponent's Digimon that has more DP than this Digimon. Can I use this card's effect to digivolve into a level 6 Digimon card with [Leomon] in its name in my hand, ignoring its digivolution requirements?
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Official Ruling
No, you can't. This card's [When Attacking] effect is an effect that activates before your opponent blocks, therefore the activation timing has already passed by the time of the block timing.