There are many ways to beat Gary. However, the best way to beat him(or so I think so) is to train your pokemon to a much higher level than his are. But you can't go too high because from your point, if your pokemon are too high of level, they won't obey you in battle. Get your pokemon to about level 30-35 and I don't think you'll have much trouble with him. Good luck with the pokemon league :3
(Traded Pokemon are only effected by the lack of Badge in terms of levels, plus Misty only goes to Lv 30 anyhow.) So just train to about 20/25)).
Beat misty then go to cerulean cape
just beat red then go to cerulean city then go to the cave
Bottom of Cerulean City
He is in a house in Cerulean City
Cerulean cape is the area north of Cerulean City. It is just north of the bridge that connects the cape to Cerulean City. The cape is any land that is above the Bridge that connects the cape to Cerulean City.
you go to cerulean city and beat misty.
beat the elite four and then you can go to the kanto region and you have to beat Brock, then get though Mount Moon to get to Cerulean city
beat Giovanni in the game corner in cerulean city
you find it in the cerulean cave behind cerulean city after you beat all the Kanto gym leaders
you catch mewtwo in the cerulean city cave after you beat the Pokemon league
Mewtwo is inside the Cerulean Cave in Cerulean City. You have to beat the entire game in order to go inside and catch it
Beat misty then go to cerulean cape
just beat red then go to cerulean city then go to the cave
you have to beat the elite four, and get the national dex. then go to cerulean city, go past the nugget bridge, and surf on the water. there is a cave,and its cerulean cave
to get to cerulean city, you need 8 johto badges and you need to beat the elite four. then you get an ss ticket from prof. elm, which will take you to vermilion city in kanto. then go south and you will end up in cerulean city.
You must beat the elite four first and then go over to the other land.
All you have to do is beat the elite 4 and go to kanto and go to cerulean city and buy it