i think you mean what type of Pokemon does the third gym use and the answer is normal type so you must defeat it with fighting type
16
Yes, you can fight the Kanto Gyms in Pokémon HeartGold.
Pokemon HeartGold, SouldSilver
In almost all of the towns/cities.
you keep on battling the gyms
No, but you can challenge kanto gyms
Gold, Silver, Crystal, HeartGold, and SoulSilver Versions. They all have 16 gyms (two regions).
no
Congratulations! You've almost beaten Pokemon HeartGold! You now have to complete the National Pokedex.
In one of the gyms. I don't know witch one.
walk in
After beating the 8 Gyms of Kanto you have to talk to prof. oak and then he will tell the guards to let you in.