>>44265898Depends, at least you potentially won't have to invest too much extra dust/candy to make the shiny gastly usable in raids/etc.
Gengar in general is outclassed by Giratina-O, so don't beat yourself up over it too much.
Consider keeping the shiny gastly as a haunter for great league, since gengar's shiny doesn't really change much until it mega evolves.
