Rulings
Q1: I used this card's On Play When Digivolving effect to give "can't suspend or activate When Digivolving effects" to 1 of my opponent's Digmon with no digivolution cards. If that Digimon later gains digivolution cards after being affected by that effect, can it suspend or activate When Digivolving effects?
No, it can't. For this card's On Play When Digivolving effect, you chose 1 of your opponent's Digmon with no digivolution cards to gain "can't suspend or activate When Digivolving effects." The effect will continue affecting the chosen Digimon even if it later gets a digivolution card.
Q2: My Digimon with this card in its digivolution cards attacked, an opponent's Digimon with digivolution cards was deleted in the battle, and after that battle, my opponent doesn't have any Digimon with digivolution cards. This Digimon gains Piercing from this card's inherited effect at such times, but does the Piercing trigger simultaneously?
Yes, it triggers. If an effect's trigger conditions are met when the effect is gained, that effect will trigger. In this case, your opponent no longer has Digimon with digivolution cards at the same timing as when your opponent's Digimon is deleted in battle, therefore you can activate Piercing.
Q3: What does "can't ... activate When Digivolving effects" mean, exactly?
This effect prevents When Digivolving effects on cards from activating. Triggered When Digivolving effects can no longer activate when a card digivolves or when effects such as "activate that card's When Digivolving" effect" activate.
Q4: I used a card affected by "can't ... activate When Digivolving effects" to attack. Can I activate that card's When Digivolving When Attacking effect at such times?
Yes, you can. The effect can activate if it's triggered upon the When Attacking timing.
Q5: If a card is affected by "can't ... activate When Digivolving effects," can it activate its own When Digivolving effect using an effect such as "activate 1 of that card's When Digivolving effects"?
No, it can't be activated.
Q6: If a card is affected by "can't ... activate When Digivolving effects," can another card's When Digivolving effect be activated using an effect such as "activate 1 of that card's When Digivolving effects as an effect of this card"?
No, it can't be activated.
Q7: Can I use "activate 1 of that card's When Digivolving effects as an effect of this card" on a card that isn't affected by "can't ... activate When Digivolving effects" to activate the When Digivolving effect on another card that's affected by "can't ... activate When Digivolving effects"?
Yes, you can.
Q8: If a card is affected by "can't ... activate When Digivolving effects," can I process just the "by doing X" condition in its When Digivolving effect?
No, you can't.
Q9: A card digivolved into a card that has a When Digivolving When Attacking Once Per Turn effect while "can't ... activate When Digivolving effects" was activated. Does that count as an instance of that effect's X Per Turn even if that effect can't be activated upon the timing when that card digivolved?
No, it doesn't count. The effect can't activate upon the When Digivolving timing, therefore it doesn't count as an instance of that effect's X Per Turn.
Data Sources
Lv.5 PolarBearmon EX8-023 U Ultimate | Vaccine | Ice-Snow/LIBERATOR [Digivolve] Lv.4 w/[Ice-Snow] trait: Cost 3 <Iceclad> (Other than against Security Digimon, compare the number of digivolution cards instead of DP in this Digimon's battles.) [On Play] [When Digivolving] Trash any 2 digivolution cards from your opponent's Digimon. Then, 1 of your opponent's Digimon with no digivolution cards can't suspend or activate [When Digivolving] effects until the end of their turn. --- Inherited: [Your Turn] While your opponent has no Digimon with digivolution cards, this Digimon with the [Ice-Snow] trait gains <Piercing> and <Security A. +1>.
Lv.5 PolarBearmon EX8-023 U Ultimate | Vaccine | Ice-Snow/LIBERATOR [Digivolve] Lv.4 w/[Ice-Snow] trait: Cost 3 <Iceclad> (Other than against Security Digimon, compare the number of digivolution cards instead of DP in this Digimon's battles.) [On Play] [When Digivolving] Trash any 2 digivolution cards from your opponent's Digimon. Then, 1 of your opponent's Digimon with no digivolution cards can't suspend or activate [When Digivolving] effects until the end of their turn. --- Inherited: [Your Turn] While your opponent has no Digimon with digivolution cards, this Digimon with the [Ice-Snow] trait gains <Piercing> and <Security A. +1>.
Lv.5 PolarBearmon EX8-023 U Ultimate | Vaccine | Ice-Snow/LIBERATOR [Digivolve] Lv.4 w/[Ice-Snow] trait: Cost 3 <Iceclad> [On Play] [When Digivolving] Trash any 2 digivolution cards from your opponent's Digimon. Then, 1 of your opponent's Digimon with no digivolution cards can't suspend or activate [When Digivolving] effects until the end of their turn. --- Inherited: [Your Turn] While your opponent has no Digimon with digivolution cards, this Digimon with the [Ice-Snow] trait gains <Piercing> and <Security A. +1>.
Lv.5 ポーラーベアモン EX8-023 U 完全体 | ワクチン種 | 氷雪型/リベレイター 特徴に「氷雪型」を持つLv.4:コスト3 ≪氷装≫（このデジモンのセキュリティデジモン以外とのバトルではDPではなく進化元枚数を比べる） 【登場時】【進化時】相手のデジモンの進化元を選んで2枚破棄する。その後、相手のターン終了まで、進化元を持たない相手のデジモン1体はレストできず、【進化時】効果は発揮しない。 --- Inherited: 【自分のターン】進化元を持つ相手のデジモンがいない間、特徴に「氷雪型」を持つこのデジモンは、≪貫通≫と≪Sアタック+1≫を得る。