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

What does this card's "can't reduce digivolution costs" effect do, exactly?
It negates effects that read, "reduce the memory cost of the digivolution by X," like and [BT3-103]/[Hidden Potential Discovered!]. Even if your opponent activates effects like these, it won't reduce the memory cost of their digivolutions. They have to pay the digivolution cost on the card in order to digivolve.
Ruled Mar 28, 2024
My opponent has this Digimon in play. If I activate on a card in my hand, will I be able to reduce digivolution costs with it?
No, you can't.
Ruled Mar 28, 2024
My opponent has this Digimon in play. Can I use effects like [BT2-111]/[Beelzemon]'s "digivolve into this card in your hand for a memory cost of X, ignoring this card's digivolution requirements" effect?
Yes. [BT2-111]/[Beelzemon]'s effect doesn't reduce digivolution costs--it allows you to ignore digivolution requirements and digivolve for a specific memory cost, so you can still activate it.
Ruled Mar 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.