Q1: Does this card's effect activate even if it has Garurumon (X Antibody) as a digivolution card?
No, only cards specifically named Garurumon meet the condition for this card's effect. The effect won't activate with card names such as Garurumon (X Antibody) that don't match, even if the name includes Garurumon.
Lv.5 WereGarurumon P-008 P Ultimate | Vaccine | Beastkin [When Attacking] [Once Per Turn] If this Digimon has a [Garurumon] digivolution card, unsuspend this Digimon. --- Inherited: [Your Turn] While you have 8 or more cards in your hand, this Digimon gains <Security Attack +1>. (This Digimon checks 1 additional security card.)
Lv.5 WereGarurumon P-008 P Ultimate | Vaccine | Beastkin [When Attacking] [Once Per Turn] If [Garurumon] is in this Digimon's digivolution card, unsuspend this Digimon. --- Inherited: [Your Turn] While you have 8 or more cards in your hand, this Digimon gains <Security A. +1>.
Lv.5 ワーガルルモン P-008 P 完全体 | ワクチン種 | 獣人型 【アタック時】[ターンに1回]このデジモンの進化元に「ガルルモン」があるとき、このデジモンをアクティブにする。 --- Inherited: 【自分のターン】自分の手札が8枚以上の間、このデジモンは《セキュリティアタック+1》(このデジモンがセキュリティにアタックしたときにチェックする枚数+1)を得る。