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

Can I choose not to activate this card’s <End Of Attack> effect by not performing "placing all digivolution cards from under this Digimon under 1 of your Tamers", thus preventing this Digimon from being deleted?
Yes, you can.
Ruled Mar 28, 2024
Can I activate this card's <End Of Attack> effect if this Digimon doesn't have any digivolution cards?
No, it doesn't activate unless you can perform "placing all digivolution cards from under this Digimon under 1 of your Tamers."
Ruled Mar 28, 2024
If I activate this card's <End Of Attack> effect, can I unsuspend a different Tamer than the Tamer under which I placed the digivolution cards?
Yes, you can.
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.