"I used this card's [On Play] effect to give 1 of my opponent’s Digimon with the lowest level ""[When Attacking] Lose 2 memory."".Then, that opponent's Digimon digivolved and another Digimon became their Digimon with the lowest level. What happens to the ""[When Attacking] Lose 2 memory"" effect?"
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Official Ruling
Your opponent's target Digimon that was specified when the effect activated will continue to have the "[When Attacking] Lose 2 memory" effect until the end of your opponent's turn.
Source: EX4-018 MailBirdamon