Yes, it also treats the Tamer as a Digimon when it digivolves. It treats it as a Digimon that digivolves, therefore "when a Digimon would digivolve" effects and "when a Digimon digivolves" effects will trigger. In addition, if a "Digimon can't digivolve" effect activates, digivolution won't be possible using this effect that also treats the Tamer as a Digimon.

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

No, it can't. Even if a card digivolves from a card that was placed on the field in the same turn, it can't attack during that turn. It can only attack in the turns after it's played.

Yes, it becomes a digivolution card. If that Digimon would leave the field, the Tamer card will be trashed like a normal digivolution card.

No, it doesn't.

Yes, it does.

It’s trashed.

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.