you go to her gym and you find your way through the invisible mave, she's the first "janine"in the gym
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In Pokémon HeartGold, Janine is the new Gym Leader of the Fuchsia City Gym in order to replace Koga as the Gym Leader there due to Koga's promotion to the Elite 4, in addition to this, Janine is also Koga's daughter.
You need to defeat the other Kanto gym leaders. If you have defeated the other 6 except for Blue, go to Cinnabar Island and talk to him there.
go to kanto and go to fucshia city and go to the gym janine is gym leader and she is kogas daughter so she has poison types.
You can not.
Janine can be found near the safari zone after beating the game you can't fight her but if you talk to her she will mention her dad koga.