Blaine, Blaine, Blaine. *shakes head* He's the easiest leader to defeat! @_@' I mean, east of Cinnabar Island(or south from Fuschia City), Seafoam Islands is nearby and inside, there are so many water Pokémon like Shellder, Dewgong, Psyduck = to mention a few. Just teach them HM03 Surf and you can take Blaine and his trainers down with one hit! @_@'

Eventually his gym is a bit hard to reach since you have to find a Secret Key that's hidden in Pokémon Mansion. It took me quite a while to get this item but it's worth it.

Firstly, you enter the mansion. Then, go down the first staircase you see. You're on the second floor now. Then hit a switch(in those statues), and a door will open. When it opens to the east, go there and go to the staircase there. Now you're in the third floor. Press a switch and go east, and jump down the balcony(the one before the scientist dude), and you're in the basement. Go west and down, where you'll see a person there. You can fight him if you want. You'll see a statue there, and flick it THREE times. Then go up to the end of the screen, and you'll see the door open with a scientist there. Battle him(you have no choice anyway) and continue going on until you find the Key.

In his gym, you have an alternative : -

Answer questions or
Fight his trainers

By answering questions correctly, you can get to Blaine without fighting anybody. ^______^ But if you get it wrong, you must fight the trainer. -_-; Eventually the questions are easy. ^_^

Winning Blaine will earn you the Volcano Badge, which increases your Pokémon's special.