The 4th gym is in celadon city it's located at the bottom left corner of the city.
Celadon city.
Open the door and challenge the gym leader.
you find delibird in island number 4 in the snow caveDelibird is uncatchable in leafgreen get one from firered.
go to youre dads gym
Both male and female are on Route 4
4 island.
After beating the elite 4 he/she randomly appears in the wild so you have to find him/her
You can find legendary pokemons after you battle the gym leaders and the elite 4.
you find him
No, but you can breed them on island 4.
"How do I get an ekans in Pokemon leafgreen?"You can't catch an ekans in Pokemon leafgreen, but you can catch it in Pokemon firered and trade it.I got my Ekans at route 10 at lv. 4
go to rustburro city to find the old man in the gym, he'll ask you some q's. if you answer them correctly he will give you the hm 4