While you are at Cinnabar Island you will find Blue. When you beat Blaine at Seafoam Island, you need to head back to Cinnabar. When you are there talk to Blue once more and he should tell you that you are good enough to battle him. After that he will head to Viridian City and you will battle Blue.
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you catch raikou on the last gym leader in the kanto leaders and you catch uxie in vermillion city from
After defeating Koga, who is the fifth gym leader in the Kanto Region, just move on to the next city. You can get the gym badges out of order, so just move on to a city that you haven't defeated yet. Save Cinnabar Island for last, though, because it definitely is the toughest gym.
It's right next to the dojo in Saffron City
Viridian City, Giovanni(Team Rocket Leader) is the Gym leader.
Going from the chronological order of the Kanto Region gyms, Blaine, the fire gym leader, and Blue, who has various types, are the last two gym leaders. Blaine is in the Seafoam Islands, and can be found by going up the first ladder you see. Blue waits for you to have the other seven Kanto badges on Cinnabar Island, and then will go to the Viridian City Gym.