4 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.
Can I activate this card's <All Turns> effect and place 4 [Vemmon] at the bottom of their owners' decks to prevent it from leaving the battle area when this Digimon is affected by a <De Digivolve> effect?
No, you can't. <De Digivolve> is not considered an effect where a Digimon would leave the battle area.
Ruled Mar 28, 2024
What does this card's "When this Digimon would leave the battle area" mean, exactly?
"When [...] would leave the battle area" refers to when this Digimon is placed in the trash, returned to the hand/deck, placed in the security stack, moved to the breeding area, or placed under another card.
Ruled Mar 28, 2024
Can I activate this card's <All Turns> effect and place 4 [Vemmon] at the bottom of their owners' decks to prevent it from leaving the battle area when this Digimon is returned to my deck or placed in my security stack?
Yes, you can activate it when this Digimon is affected by effect that moves it to one of those areas.
Ruled Mar 28, 2024
Can I activate this card's <Start Your Main> effect if an effect at the start of my turn or during my unsuspend phase or breeding phase causes the memory counter to move to my opponent's side and it becomes my opponent's turn?
No, it doesn't activate if it becomes your opponent's turn before your main phase.
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.