"Is an 89% lucky Shadow Claw Gengar worth any of my +2million dust?" is essentially the question you asked. Subtle brag is not so subtle.
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But it has only 12 attack! /s
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You've got over 2 million dust and 600 candies. And it's a LUCKY legacy Gengar.
Did you really need advise? Your stardust storage wouldn't even see a dent tbh.
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way 2 be an asshole
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Transfer for more gastly candy
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I am afraid not, you should transfer it
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The defensive rebalance gave Gengar more bulk, but the effectiveness rebalance undid that. Giratina and Cresselia already had their months, but Gengar will remain useful for the lake trio (only Azelf has a high attack stat).