This page notes details of Crystal Beast Emerald Tortoise (WATER/Aqua/Effect Monster) : decks, tips, effect and rulings. Learn and enjoy playing Yu-Gi-Oh! Duel Links!
Once per turn: You can target 1 monster you control that attacked this turn; change that target to Defense Position. If this face-up card is destroyed while it is in a Monster Card Zone, you can place it face-up in your Spell & Trap Card Zone as a Continuous Spell Card, instead of sending it to the Graveyard.
Yes, although it didint state main phase 2, it is impossible to activate its effect in main phase 1 since no monster's have attacked by then
And to add, it is not quick effect, thus cannot be activated during battle phase either.
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