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.
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Go to the forth gym!
the 13th badge you get in soul silver is in fucshia city, from janine she is a poison type expert, as she is koga-of-the-elite-four's daughter.
It is attainable in poke mart after the 3 gym badge (i think)
In one of the gyms. I don't know witch one.
There is no best Pokemon on Pokemon HeartGold.