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.