Q1: Can this card's On PlayWhen Digivolving effect cause my Digimon to rest?
Yes, it is possible. Since the player is not specified, either Digimon can be specified as the target of the effect.
Q2: Can this card's On PlayWhen Digivolving effect resolve the "If my Digimon is rested by this effect" effect if I designate my Digimon in a rested state?
No, it cannot. Designating Digimon, which is already rested, as the target of the "Rest" effect does not mean that it is rested.
Q3: Does the Your Turn effect of the INHERITED effect of this card trigger when the target of the attack is changed from the player to the opponent's Digimon by the Rush effect?
No, it does not trigger.
Lv.5 GrandGalemon ST18-10 R Ultimate | Bird Dragon/Vortex Warriors/LIBERATOR [On Play] [When Digivolving] Suspend 1 Digimon. If this effect suspended your Digimon, you may play 1 Digimon card with [Avian] or [Bird] in any of its traits and 3000 DP or less from your hand without paying the cost. --- Inherited: [Your Turn] [Once Per Turn] When this Digimon attacks your opponent's Digimon, this Digimon may unsuspend.
Lv.5 GrandGalemon ST18-10 R Ultimate | Data | Bird Dragon/Vortex Warriors/LIBERATOR [On Play] [When Digivolving] Suspend 1 Digimon. If this effect suspended your Digimon, you may play 1 Digimon card with [Avian] or [Bird] in any of its traits and 3000 DP or less from your hand without paying the cost. --- Inherited: [Your Turn] [Once Per Turn] When this Digimon attacks your opponent's Digimon, this Digimon may unsuspend.
Lv.5 GrandGalemon ST18-10 R Ultimate | Data | Bird Dragon/Vortex Warriors/LIBERATOR [On Play] [When Digivolving] Suspend 1 Digimon. If this effect suspends your Digimon, you may play 1 Digimon card with the [Bird] or [Avian] in one of its traits with 3000 DP or less below from your hand without paying the cost. --- Inherited: [Your Turn] [Once Per Turn] When this Digimon attacks your opponent's Digimon, you may unsuspend this Digimon.
Lv.5 グランゲイルモン ST18-10 R 完全体 | データ種 | 鳥竜型/ヴォルテクスウォリアー/リベレイター 【登場時】【進化時】デジモン1体をレストさせる。この効果で自分のデジモンがレストしたなら、自分の手札から、特徴に「鳥」を含むDP3000以下のデジモンカード1枚をコストを支払わずに登場できる。 --- Inherited: 【自分のターン】[ターンに1回]このデジモンが相手のデジモンにアタックしたとき、このデジモンをアクティブにできる。