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The owner of "Nimble Momonga" will get the increase in Life Points if "Nimble Momonga" is destroyed in battle, regardless of who controlled "Nimble Momonga."
The owner of "Nimble Momonga" activates its effect because it activates in its owner's GY.
Gaining Life Points is mandatory, but Special Summoning "Nimble Momonga" from the Deck is not. You Special Summon the "Nimble Momonga" when you gain the Life Points.