2 official rulings from Bandai, last ruled Sep 6, 2024. Straight answers to how this card actually resolves.

Can I use this card’s <Delay> effect to place a Digimon card with [Pulsemon] in its text and no digivolution cards on top of my security stack?
No, you can't. "Top card" refers to 1 or more cards with cards underneath it.
Ruled Sep 6, 2024
Can I use this card’s <Delay> effect to place a Digimon card with [Pulsemon] in its text that has just 1 Tamer card under it on top of the security stack?
Yes, you can. After you place it on top of the security stack, the Tamer card will become the top card and it will remain in the battle area as a Tamer.
Ruled Sep 6, 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.