you must go to celadon city and enter a building with an old woman surrounded by Pokemon. she will give you a drink and when you take it to the guard he will let you trhough.
surf from celadon city and fushia city.
You can't reach johto in leafgreen.
You cannot reach jhoto in leafgreen because the tohjo falls are not in the game.
there is no way you can reach the hoenn region.
4 island in icefall cave to reach lorelei you need to find HM7 inside icefall cave.
you must defeat the elite for and possibly have to have national dex to reach the rest of the sevii islands -pokemaster
To get togepi go to five island and use Surf and go north to Water Labyrinth and then go west go past the rocks to reach a small island talk to the gentleman and show him a Pokemon that highly trusts you he will give you an egg. Hatch the egg to receive togepi.
You can get electric Pokemon on Leafgreen by going in the Power Plant. You have to go upwards from the Pokemon Center near the Rock Tunnel until you reach water then surf through the water till you see a Pokemaniac (The Pokemon trainer there) stop there and go ahead and at last you will see a tall and big building, it is the Power Plant.
you need to get surf and teach it to a pokemon. Surd is found when in the safari zone (when you reach the end).
Its located to the right of cinnibar island also if you go southwest from fuchsia city you can reach there as well.
The Pokemon League is in Ever Grande City, but before you can reach it you have to pass Victory Road.
get another trapinch