5 official rulings from Bandai, last ruled Sep 13, 2024. Straight answers to how this card actually resolves.

Can I use this card's <Main Timing> effect to trash 1 Digi-Egg card in the breeding area?
Yes, you can. Digi-Egg cards in the battle area and breeding area are treated as Digimon, so they can be trashed.
Ruled Mar 28, 2024
Can I perform just "deleting 1 of your [Ukkomon]" or "trashing 1 of your Digimon in the breeding area" to play a [BigUkkomon] into the breeding area for this card's <Main Timing> effect?
No, you can't. You must perform both "deleting 1 of your [Ukkomon] and trashing 1 of your Digimon in the breeding area" to play a [BigUkkomon] into the breeding area.
Ruled Mar 28, 2024
After performing "deleting 1 of your [Ukkomon]" and "trashing 1 of your Digimon in the breeding area," can I choose to not play a [BigUkkomon] into the breeding area for this card's <Main Timing> effect?
Yes, the effect reads “you may play."
Ruled Mar 28, 2024
Is <Overflow> processed when this card's <Main Timing> effect trashes a Digimon with <Overflow> in the breeding area?
Yes, it's processed. <Overflow> is processed when a card is sent from the area or from under a card to another area. In this case, it's processed because a card from the area is placed in the trash.
Ruled Sep 13, 2024
Is <Overflow> processed when this card's <Main Timing> effect trashes a Digimon in the breeding area that has a card with <Overflow> in its digivolution cards?
Yes, it's processed. <Overflow> is processed when a card is sent from the area or from under a card to another area. In this case, it's processed because it's placed into the trash from under a card.
Ruled Sep 13, 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.