Vulcan S - patch notes

So, does anyone know where this supposed Vulcan S egg drops? I think the previous patch notes it said it can now drop but I have not seen it.

I don't think Vulcan S is possible to get in the global server, he was added last year in Japan during the Christmas event also none of the recent patch notes says anything about him

My bad - didn't see you were looking for the S variant. Ignore me 🙂