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?

Can I activate this card's [End of Attack] effect if this Digimon doesn't have any digivolution cards?

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?