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

Can I use this card's <Your Turn> effect to digivolve into [Angewomon] or [LadyDevimon] in the trash regardless of its digivolution requirements?
No, you can't. You can’t ignore digivolution requirements when using this card's <Your Turn> effect.
Ruled Jun 28, 2024
I activated this card's <Your Turn> effect when I played [ST10-04]/[Gatomon]. At such times, I want to digivolve [ST10-04]/[Gatomon] into [Angewomon] or [LadyDevimon] with the cost reduced by 1, but can I use [ST10-04]/[Gatomon]'s <Your Turn> effect to reduce the digivolution cost again by 2?
Yes, that's correct.
Ruled Jun 28, 2024
Can I use this card's <End Your Turn> effect to DNA digivolve into a Digimon card in the hand that doesn't have [DNA Digivolution]?
No. You can’t ignore the digivolution requirements, so you can’t DNA digivolve into a Digimon card that doesn’t have [DNA Digivolution].
Ruled Jun 28, 2024
Can I use this card's <End Your Turn> effect to DNA digivolve using Digimon cards in the hand that aren't specified in [DNA Digivolution]?
No. You can’t ignore the digivolution requirements, so you can’t DNA digivolve using Digimon that aren’t specified in [DNA Digivolution].
Ruled Jun 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.