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

Can I activate this card’s <When Digivolving><Main Timing> effect both for a digivolution into this card and for the main phase in the same turn?
No, you can't. This effect is a <Once> effect, therefore it can't activate again during the same turn that it activated for <When Digivolving>, even if the timings are different.
Ruled Mar 28, 2024
When I use this card’s <When Digivolving><Main Timing> effect to play a card with the [Royal Knight], can I activate both this card's effect and my [BT13-007]/[King Drasil_7D6]'s effect to reduce the play cost according to each respective effect?
Yes, you can.
Ruled Mar 28, 2024
When I play a card with the [Royal Knight] or a green Digimon card, does this card's <All Turns> effect also give <Blocker> to that played Digimon?
Yes, it does. Note that this effect applies to ""all of your Digimon with the [Royal Knight] and all your green Digimon,"" therefore any applicable Digimon that are placed in the battle area after this effect activates will also receive <Blocker>.
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.