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

Can I use this card's <Main Timing> effect to pay 4 cost even when I don't have any level 5 or higher Digimon?
No, you can't. The activation conditions include paying 4 cost and placing this card as 1 of your level 5 or higher Digimon's bottom digivolution card, therefore the effect can't be activated just by paying 4 cost.
Ruled Sep 6, 2024
Can I use this card's <Main Timing> effect to place this card as 1 of my level 5 or higher Digimon's bottom digivolution card and suspend 1 of my opponent's Digimon without attacking?
No, you can't. You must choose to suspend 1 of your opponent's Digimon and attack, or you must choose to not suspend 1 of your opponent's Digimon and not attack.
Ruled Sep 6, 2024
If my Digimon with multiples of this card in its digivolution cards would be deleted, can I use this card's <All Turns> inherited effect to play multiples of [Parasitemon]?
Yes, you can. However, if this card is played before the effect activates, this card's <All Turns> inherited effect can no longer be activated.
Ruled Sep 6, 2024
Got a line that uses Parasitemon? Map it in the builder and share it with a link.
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.