You must go get some medicine for her from cainwood, and bring it to her at the top of the lighthouse. Then she will return to her gym.
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Get her phone number registered in pokemon then ring her if you would want to battle her again
I don't think you can battle Gardenia in Pokemon HeartGold.
go to cianwood pharmacy hope that helped
You trade any Pokemon for Jasmine's Steelix, and it will be holding a Soothe Bell.
let your Pokemon battle