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

Can I use this card's <Main Timing> effect to attack my opponent with 1 of my Digimon with [Greymon] that is suspended or was played in the same turn?
No, you can't. This card's effect doesn't let you attack with a Digimon that's in a state where it can't attack.
Ruled Mar 28, 2024
If a digivolution card has the [X Antibody], does it meet this card's "if you have a Digimon with [X Antibody] in its digivolution cards in play" condition?
No. [X Antibody] in this effect's text refers to the card name, therefore only a card with [X Antibody] as its card name will meet the condition. It doesn't refer to the [X Antibody].
Ruled Mar 28, 2024
When I use this card's <Main Timing> effect to attack, does the attacking Digimon's <When Attacking> effect activate?
Yes, it activates.
Ruled Mar 28, 2024
Can I use this card's <Main Timing> effect to have one of my opponent's Digimon attack when one of my Digimon with [Greymon] has a "this Digimon can also attack your opponent's unsuspended Digimon" effect?
No, you can't. This card's effect only allows you to attack a player.
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.