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Pokemon DP is adding a lot of characters from the games into the anime and the writers doesn't suffer much from amnesia these day. So I think the odds are good for Jasmine to appear in the anime as well.
As for you question in the title of this thread... Nope, I don't think a Johto Gym would appear in Shinnoh, because trainers would have to travel from Johto to Shinnoh just for a single badge and travel back. Definitely not worth the trip for most trainers.:P
I personally hope that she will because she's my favorite Gym Leader. But I agree with Unown_ on the fact of the writers becoming better and with DonRoyale and gars about her introducing Magnezone.