Go To The Lighthouse all the way to the left go up and he will stand in the middle and come 2 you now you can enter the Gym
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get the 7th gym badge
The 8th and last gym is in Sunyshore City.
You will need to defeat Volkner, the Sunyshore City Gym Leader.
You have to have defeated the seventh gym leader in Snowpoint city
you go to sunyshore city and beat that gym leader