Q1: If a Digimon card with the X Antibody trait is in this Digimon's digivolution cards, can this Digimon attack?
No, it can't.
Lv.3 Gotsumon (X Antibody) P-144 P Rookie | Data | Rock/X Antibody [Digivolve] [Gotsumon]: Cost 0 <Blocker> [Your Turn] This Digimon can't attack without [Gotsumon] or [X Antibody] in its digivolution cards. [Opponent's Turn] [Once Per Turn] When attack targets change, 1 of your Digimon with <Blocker> may unsuspend. --- Inherited: [All Turns] All of your Digimon with Inherited: get +1000 DP.
Lv.3 Gotsumon (X Antibody) P-144 P Rookie | Data | Rock/X Antibody [Digivolve] [Gotsumon]: Cost 0 <Blocker> [Your Turn] This Digimon without [Gotsumon]/[X Antibody] in its digivolution cards can't attack. [Opponent's Turn] [Once Per Turn] When the attack target is switched, you may unsuspend 1 of your Digimon with <Blocker>. --- Inherited: [All Turns] All of your Digimon with <Blocker> get +1000 DP.
Lv.3 Gotsumon (X Antibody) P-144 P Rookie | Data | Rock/X Antibody [Digivolve] [Gotsumon]: Cost 0 <Blocker> [Your Turn] This Digimon without [Gotsumon] or [X Antibody] in it's digivolution cards can't attack. [Opponent's Turn] [Once Per Turn] When an attack target is switched, you may unsuspend 1 of your Digimon with <Blocker>. --- Inherited: [All Turns] All of your Digimon with <Blocker> get +1000 DP.
Lv.3 ゴツモンX抗体 P-144 P 成長期 | データ種 | 鉱石型/X抗体 「ゴツモン」:コスト0 ≪ブロッカー≫ 【自分のターン】進化元に「ゴツモン」/「X抗体」がないこのデジモンはアタックできない。 【相手のターン】[ターンに1回]アタックの対象が変更されたとき、≪ブロッカー≫を持つ自分のデジモン1体をアクティブにできる。 --- Inherited: 【お互いのターン】≪ブロッカー≫を持つ自分のデジモン全てをDP+1000。