Q1: After this card's On PlayWhen Digivolving effect is activated, if a Digimon of opponent without a Digivolution card has a Digivolution card later, can that Digimon be rested? Can the Digimon be rested?
Yes, it can be rested. This card's "All opponent's Digimon without a digivolution card cannot be rested" effect affects Digimon without a digivolution card. Digimon with a later digivolution card are no longer subject to this effect.
Lv.6 AncientMegatheriummon BT18-028 R Mega | Data | Ancient Animal/Ten Warriors [On Play] [When Digivolving] Trash the bottom 2 digivolution cards of all of your opponent's Digimon. Until the end of their turn, none of their Digimon with no digivolution cards can suspend. [All Turns] When this Digimon would leave the battle area, you may play 1 level 4 or lower Digimon card with the [Mammal], [Ice-Snow] or [Hybrid] trait from this Digimon's digivolution cards without paying the cost. (Rule) Trait: Has [Ice-Snow] Type. DigiXros -2: [Kumamon]×[Korikakumon]
Lv.6 AncientMegatheriummon BT18-028 R Mega | Data | Ancient Animal/Ten Warriors [On Play] [When Digivolving] Trash the bottom 2 digivolution cards of all of your opponent's Digimon. None of their Digimon with no digivolution cards can suspend until the end of their turn. [All Turns] When this Digimon would leave the battle area, you may play 1 level 4 or lower Digimon card with the [Mammal], [Ice-Snow] or [Hybrid] trait from this Digimon's digivolution cards without paying the cost. (Rule) Trait: Has [Ice-Snow] type. DigiXros -2: [Kumamon]×[Korikakumon]
Lv.6 エンシェントメガテリウモン BT18-028 R 究極体 | データ種 | 古代獣型/十闘士 【登場時】【進化時】相手のデジモン全ての進化元を下から2枚破棄する。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全てはレストできない。 【お互いのターン】このデジモンがバトルエリアを離れるとき、このデジモンの進化元から、特徴に「哺乳類型」/「氷雪型」/「ハイブリッド体」を持つLv.4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。 〈ルール〉特徴:タイプ「氷雪型」を持つ。 「チャックモン」×「ブリザーモン」 登場するとき、手札/バトルエリアからこのカードの下に置ける。1枚ごとに登場コストをマイナスする