I have a golbat that keeps trying to evolve and it doesn't even when I don't press anything, any clue why?

Question

It's in leaf green and a ? Keeps apering ...

Answer 1

You need to defeat the Elite Four and obtain the National PokeDex before evolving. Crobat is a Gen II Pokemon, and isn't in the PokeDex.

Comments

but LG is gen3...

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Did you mabye give it an everstone?

 http://serebii.net/itemdex/everstone.shtml

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it wouldnt enter the evolution screen if it was holding a everstone

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@TR, LeafGreen still can have Gen 2 Pokemon.