To get the 8th Gym Leader to return to his Gym in Viridian City, you must defeat all 7 other Gym Leaders.
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Blue (The eighth gym leader) is waiting on Cinnabar. He won't battle you unless you've beat the rest of the gym leaders
The eighth gym leader is in the underwater city(forget the name) but it is where you fight groudon. after you beat him the gym should be open.
8th Gym Leader: Claire8th GYM Leader is Claire of Blackthorn City. She uses dragon Pokemon. Yes indeed Claire is the 8th gym leader in gold/silver/crystal and she uses dragon type Pokemon just like lance
The 5th gym is the Fuchia city gym Gym leader Koga
the seventh gym leader is in Foam Island to the right of where blue is(on the map) ,(where he tells you to get the seventh gym badge) the seventh gym leader uses fire type Pokemon so having Suicune, Lugia, and Snorlax is an advantage.(snoralax can use water moves too... i don't know why cuz he's not even water type...) the eighth gym leader has very strong Pokemon so level your Pokemon alot. Note: Blue is so strong he killed my level 70 ho-oh...