7 official rulings from Bandai, last ruled Dec 6, 2024. Straight answers to how this card actually resolves.

For this card's [All Turns] effect, if there are both "Skull Knightmon" and "Deadly Axmon" as digivolves, do I always have to play both?
No, it is "can appear" and you can choose whether or not to have it play. However, if you have both "Skull Knightmon" and "Deadly Axmon" as digivolution cards, you can either play both of them or none of them.
Ruled Jul 15, 2022
Can this card's <On Play> effect place a [SkullKnightmon] in my hand and a [DeadlyAxemon] in my trash in this Digimon’s digivolution cards?
Yes. You can mix and match [SkullKnightmon] and [DeadlyAxemon] from both your hand and trash to place in this Digimon’s digivolution cards.
Ruled Mar 28, 2024
If I have both [SkullKnightmon] and [DeadlyAxemon] in this Digimon’s digivolution cards, does this card’s <All Turns> effect require me to play both?
No. The effect reads, “you may,” so you can choose whether to play them. However, if both [SkullKnightmon] and [DeadlyAxemon] are in digivolution cards, you must choose to either play both of them or play none of them.
Ruled Mar 28, 2024
Can this card's <On Play> effect place cards in this Digimon's digivolution cards if I don’t have both a [SkullKnightmon] and [DeadlyAxemon] in either my hand or trash?
Yes. You don't have to place both a [SkullKnightmon] and a [DeadlyAxemon]. You can also place either of them on their own from either your hand or trash in this Digimon's digivolution cards.
Ruled Mar 28, 2024
When does the <All Turns> effect of the Digimon trigger?
The <All Turns> effect triggers and activates immediately prior to the Digimon being deleted. In this way, the <All Turns> effect has the same timing as effects that say, “when this Digimon would be deleted”.
Ruled Dec 6, 2024
Can this card's [On Play] effect put "Skull Knightmon" from my hand and "Deadly Axmon" from my trash to digivolving card respectively?
Yes, you can put "Skull Knightmon" and "Deadly Axmon" from both hand and trash to digivolution card.
Can this card's [On Play] effect be placed in the digivolving card unless I have both "Skull Knightmon" and "Deadly Axmon" in my hand or trash?
No. Even if you only had either "Skull Knightmon" or "Deadly Axmon", you can still place them on the digivolution card.
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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.