What are legacy charge moves?
I was looking at the Gengar page to determine which Gengars I should keep based on moveset. However, no movesets with Sludge Wave in them were ranked/rated, so idk whether to keep these guys.
I scrolled down to look at DPS and whatnot hoping that would help me make a decision and I noticed that Sludge Wave wasn't in the Charge Move category, but rather in the Legacy Charge Move category. What does this mean?
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Answers
Niantic changed the possible movesets for some Pokemon a while back:
https://pokemongo.gamepress.gg/news/819-new-movesets-and-dodge-reduction
So Sludge Wave was removed from Gengar's possible moveset. Existing Pokemon moves won't change, but all new Pokemon - caught, hatched, evolved - no longer have access to these legacy moves. A Gengar with Sludge Wave is now we termed as legacy Pokemon.
If/when trading gets implemented, legacy Pokemon would probably be considered rarity, and probably holds a bit of value.
Regardless of merit, keep hold of it!