

Q1: This card's effect caused the DP of my opponent's Digimon to become 0. At such times, is the Digimon with a DP of zero deleted?
No, it isn't deleted yet. Once all of the processing for the activated effect has resolved, a rule check will occur, then all of the Digimon with 0 DP are deleted at the same time.
Lv.4 Gatomon BT24-035 C Champion | Vaccine | Holy Beast/Iliad/TS [On Play] [When Digivolving] 1 of your opponent's Digimon gets -3000 DP for the turn. Then, if it's your turn, 2 of your Digimon may DNA digivolve into [Silphymon] in the hand. --- <Barrier> (When this Digimon would be deleted in battle, by trashing your top security card, it isn't deleted.)
Lv.4 Gatomon BT24-035 C Champion | Vaccine | Holy Beast/Iliad/TS [Digivolve] Lv.3 w/[TS] trait: Cost 2 [On Play] [When Digivolving] 1 of your opponent's Digimon gets -3000 DP for the turn. Then, if it's your turn, 2 of your Digimon may DNA digivolve into [Silphymon] in the hand. --- <Barrier> (When this Digimon would be deleted in battle, by trashing your top security card, it isn't deleted.)
Lv.4 Gatomon BT24-035 C champion | Vaccine | Holy Beast/Iliad/TS [Digivolve] Lv.3 w/[TS] trait: Cost 2 [On Play] [When Digivolving] 1 of your opponent's Digimon gets -3000 DP for the turn. Then, if it's your turn, 2 of your Digimon may DNA digivolve into [Silphymon] in the hand. --- <Barrier>
Lv.4 テイルモン BT24-035 C 成熟期 | ワクチン種 | 聖獣型/イリアス/TS 【登場時】【進化時】ターン終了まで、相手のデジモン1体をDP-3000。その後、自分のターンなら、自分のデジモン2体で手札の「シルフィーモン」にジョグレス進化できる。 --- ≪防壁≫(このデジモンがバトルで消滅するとき、自分のセキュリティを上から1枚破棄することで、消滅しない)