No, you can't. For this card's 1st effect, you declare a digivolution, then upon revealing this card, you can also choose a Tamer as the card to digivolve, and that Tamer is also treated as a level 3 Digimon. As with the normal digivolution procedure, after revealing this card and declaring a digivolution, you can't choose to not digivolve. In addition, you can't declare digivolution into this card in the first place unless there is a card on the field that you can digivolve.

Yes, treat the Tamer as if it is a Digimon when digivolving. "When digivolving" effects and "when a Digimon digivolves" effects are triggered.Additionally, if a "Digimon can't digivolve" effect has activated, you cannot digivolve a Tamer as if it is a Digimon with this effect.

Yes, you do.A digivolution bonus draw is performed for any kind of digivolution.

No, it can't. A card cannot attack on the turn it is played, even if it digivolves from a card placed on the field. It can only attack if it was not played that turn.

Yes, it is.If the Digimon leaves the field, that Tamer is trashed like normal digivolution cards.

No, they do not.

Yes, it does.