Q1: The situation is that "BT19-024 Marimburumon" with this card as its digivolution card is in the Battle Area. When the opponent's Digimon attacks, can I return "BT19-024 MarineBrumon" to the bottom of the deck by this card's digivolution card's inherited effect, activate "Decode《Blue Lv.4》" of "BT19-024 MarineBrumon" and then return an opponent Digimon of Lv. 5 or lower to my hand?
Yes, it activates "Decode《Decode《Blue Lv.4》" and then it can be returned to your hand. In this situation, "Decode《Blue Lv.4》" can be activated by interrupting the card's digivolution card's inherited effect. Once activated, return "BT19-024 Marimburumon" to the bottom of the deck and return one opponent's Digimon of Lv.5 or lower to your hand.
Lv.2 Puyoyomon BT19-002 C In-Training | Lesser/LIBERATOR | - - --- Inherited: [Opponent's Turn] When any of your opponent's Digimon attack, by returning this Digimon with [Aqua] or [Sea Animal] in any of its traits to the bottom of the deck, return 1 of your opponent's Digimon with as high or lower a level as the returned Digimon to the hand.
Lv.2 Puyoyomon BT19-002 C In-Training | Lesser/LIBERATOR - --- Inherited: [Opponent's Turn] When any of your opponent's Digimon attack, by returning this Digimon with [Aqua] or [Sea Animal] in any of its traits to the bottom of the deck, return 1 of your opponent's Digimon with as high or lower a level as the returned Digimon to the hand.
Lv.2 Puyoyomon BT19-002 C In-Training | Lesser/LIBERATOR - --- Inherited: [Opponent's Turn] When any of your opponent's Digimon attack, by returning this Digimon with [Aqua] or [Sea Animal] in one of its traits to the bottom of the deck, return 1 of your opponent's Digimon with as high or lower a level as the returned Digimon to the hand.
Lv.2 プヨヨモン BT19-002 C 幼年期 | レッサー型/リベレイター - --- Inherited: 【相手のターン】相手のデジモンがアタックしたとき、特徴に「水棲」を含むこのデジモンをデッキの下に戻すことで、戻したデジモンのLv.以下の相手のデジモン1体を手札に戻す。