You can't use a stone on gastly to make it evolve it evolves at level 22.
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gastly evolve on level 25
No stone makes deino evolve but he evolves at level 50 and then 64
it does not use a stone to evolve but you can levell it up to 36 and it will evolve
Gastly evolves at LV. 25
Gastly evolves at level 25.