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

I digivolve into a green level 6 Digimon with this card's <When Attacking> effect. Can I activate that Digimon’s <When Attacking> effects?
No. It is too late to trigger those <When Attacking> effects because it did not have them when the attack was declared.
Ruled Mar 28, 2024
When attacking, do I have to reveal 3 cards from my deck with this card’s <When Attacking> effect?
Yes, the effect is mandatory. You reveal as many cards as you can, up to 3.
Ruled Mar 28, 2024
If a green level 6 Digimon card is among the cards revealed with this card’s <When Attacking> effect, do I have to digivolve into it?
No. The effect reads, “You may digivolve,” so you can choose not to.
Ruled Mar 28, 2024
If 2 or more green level 6 Digimon cards are among the cards revealed with this card’s <When Attacking> effect, can I choose either card to digivolve into?
Yes, you can digivolve into the Digimon of your choosing.
Ruled Mar 28, 2024
When digivolving with this card’s <When Attacking> effect, do I draw a card as a digivolution bonus?
Yes, you do.
Ruled Mar 28, 2024
Got a line that uses MameTyramon? Map it in the builder and share it with a link.
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.