

Q1: Can I use this card's effect to attack even when this Digimon is suspended?
No, you can't. This effect does not allow you to attack with Digimon that are in a state where they can't attack.
Q2: I activated this card's effect and paid 2 cost. This moved the memory to 1 or more on my opponent’s side. Can this Digimon attack?
Yes, it can attack.
Q3: If this effect moved the memory to 1 or more on my opponent’s side, is the Security Attack +1 gained for the turn negated for attacks with this effect?
No, Security Attack +1 isn't negated. Even if the memory moves to 1 or more on your opponent's side, while this effect is activating or if there are any effects that are pending activation, the end of turn timing doesn't come until they finish activating.
Lv.5 SkullMeramon BT15-015 C Ultimate | Data | Flame [Main] [Once Per Turn] By paying 2 cost, this Digimon gains <Security A. +1> for the turn. Then, this Digimon may attack. ---
Lv.5 SkullMeramon BT15-015 C Ultimate | Data | Flame [Main] [Once Per Turn] By paying 2 cost, this Digimon gains <Security A. +1> for the turn. Then, this Digimon may attack. --- -
Lv.5 SkullMeramon BT15-015 C ultimate | Data | Flame [Main] [Once Per Turn] By paying 2 cost, this Digimon gains <Security A. +1> for the turn. Then, this Digimon may attack.
Lv.5 デスメラモン BT15-015 C 完全体 | データ種 | 火炎型 【メイン】[ターンに1回]2コスト支払うことで、ターン終了まで、このデジモンは≪Sアタック+1≫を得る。その後、このデジモンでアタックできる。 ---