It's right next to the dojo in Saffron City
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You beat the 6th gym leader.
defeat all the other gym leaders
actually there isn't 9 gym leader there is only 8 like the other ones. Actually, the 9th gym leader in heartgold and soulsilver would be the first gym leader in Kanto after you beat the elite four the first time, you can face the kanto gym leaders in any order.
Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
Go to the gym in Vermillion City in Kanto and battle Lt. Surge, the Gym Leader. He'll give you the 9th Gym Badge after you defeat him.