Well, it depends. If you have already beat the Safron, Celadon, Fuschia and Vermillion gyms, you have to have a radio card(you can get that at the goldenrod radio tower) and then head over to Lavender Town's Tower and you'll get a pokeflute tune on your radio card and play it to Snorlax so it will wake up and move over by Diglett's Cave. Once through the cave you will be in Pewter City to beat Brock and then you can finish game.
Beat misty then go to cerulean cape
you go to the bridge north of cerulean, beat the foreign team rocket guy then he should tell you where it is
in cerulean city in the gym idiots
Once you fixed the Power Plant, go to the end of Route 25. Talk to Misty and she'll return to the gym. Then you can beat her. (She uses water Pokemon so I suggest you use grass or electric Pokemon.)
With Pokemon ---- No seriously though , just get a bellsprout and train it a bit..( lvl 18)
Beat misty then go to cerulean cape
Have about 2 or 3 pokemon only. If you fight every trainer you should be okay.
NO
You don't.
you go to the bridge north of cerulean, beat the foreign team rocket guy then he should tell you where it is
I don't have heart gold but its Vermilloin city next gym leader is Lt.Surge he has electric Pokemon No,Brock is next,ok?
route 25
Some options that could beat Misty's last Pokemon would be either the Razor Leaf, Vine Whip or Solar Beam attacks.
you go to cerulean city and beat misty.
After you defeat Misty, You can go catch suicune by Bill`s house.
Once you beat the Pokemon League at the Indego Platue, you will be able to go to Kanto and see Misty.
beat misty in second gym