go to get the 7th gym badge then youll suddenly take of to a place called treasure beach and it has 4 small islands called 1 island 2 island island and woods go to varidian citys gym to fight the gymleader giovvani[leader of team rocket]then head to the elite 4 to figght your rival then get past victory road to fight the elite 4 and your rival[the champion].
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its actually the 8th gym so you need 7 badges and then it will unlock
You have to get Kyogre and then go to the ciuty it is in and got to the chamber.
Once everything else has been completed and you have arrived back in Pallet Town, head back toward Viridian City. When you make your way past the trainers etc you will have arrived at the gym to battle Giovanni.
Head back to Viridian City and challenge the gym there (it will be open now) to get your 8th badge. After that come the Pokemon league.
In Pokémon Yellow, the 8th Gym Leader, the Viridian City Gym Leader, Giovanni's Pokémon are Persian, Dugtrio, Nidoqueen, Rhydon and Nidoking. Persian is at Level 53, Dugtrio at Level 50, Nidoqueen at Level 53, Nidoking at Level 55 and Rhydon at Level 55.