I have a [Jesmon GX] that has <Security Attack> in play, while my opponent has a [BT10-042 Venusmon] in play. If I use this card and target my [Jesmon GX], can this card's effect activate [Jesmon GX]'s [When Digivolving] effects?
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No. Because [Jesmon GX]'s [When Digivolving] and [When Attacking] effects cannot be activated due to your opponent's [BT10-042 Venusmon], even this card can't activate those effects in these circumstances.
Source: BT10-110 Seiken Meppa