

Q1: A Digimon with this card in its digivolution cards attacks, and another effect trashes a card from my hand. At such times, if I activate this card's inherited effect and perform a digivolution into P-209 Titamon, can I then activate P-209 Titamon's Alliance?
No, you can't. Alliance is an effect that triggers upon an attack. You can't activate it if the Digimon doesn't have Alliance upon the attack declaration.
Lv.3 Salamon BT26-066 C Rookie | Vaccine | Mammal/Titan/TS [Start of Your Main Phase] If your hand has 5 or fewer cards, 1 of your Digimon with the [Titan] trait may digivolve into a Digimon card with the [Titan] trait in the trash with the cost reduced by 2. --- [Your Turn] [Once Per Turn] When your hand is trashed from, this [Titan] trait Digimon may digivolve into [Titamon] or a [Titan] trait Digimon card in the trash with the cost reduced by 1.
Lv.3 Salamon BT26-066 C Rookie | Vaccine | Mammal/Titan/TS [Digivolve] Lv.2 w/[TS] trait: Cost 0 [Start of Your Main Phase] If your hand has 5 or fewer cards, 1 of your Digimon with the [Titan] trait may digivolve into a Digimon card with the [Titan] trait in the trash with the cost reduced by 2. --- [Your Turn] [Once Per Turn] When your hand is trashed from, this [Titan] trait Digimon may digivolve into [Titamon] or a [Titan] trait Digimon card in the trash with the cost reduced by 1.
Lv.3 Salamon BT26-066 C rookie | Vaccine | Mammal/Titan/TS [Digivolve] Lv.2 w/[TS] trait: Cost 0 [Start of Your Main Phase] If your hand has 5 or fewer cards, 1 of your Digimon with the [Titan] trait may digivolve into a Digimon card with the [Titan] trait in the trash with the cost reduced by 2. --- [Your Turn] [Once Per Turn] When your hand is trashed from, this [Titan] trait Digimon may digivolve into [Titamon] or a [Titan] trait Digimon card in the trash with the cost reduced by 1.
Lv.3 プロットモン BT26-066 C 成長期 | ワクチン種 | 哺乳類型/タイタン族/TS 【自分のメインフェイズ開始時】自分の手札が5枚以下なら、特徴「タイタン族」を持つ自分のデジモン1体をトラッシュの特徴「タイタン族」を持つデジモンカードに支払うコスト-2で進化できる。 --- 【自分のターン】[ターン1回]自分の手札が破棄されたとき、特徴「タイタン族」を持つこのデジモンをトラッシュの「タイタモン」か特徴「タイタン族」を持つデジモンカードに支払うコスト-1で進化できる。