If you put it in your DS with D/P magbys will appear in the game only if you play D/P while it is in.
you cant get toros on leafgreen you need to catch one on firered and trade it to leafgreen
To obtain a growlithe on Pokemon Leafgreen you need to trade it over
You can't catch mew on leafgreen you need gameshark codes for that
You don't catch Butterfree. You need to evolve a Metapod.
You can't catch it! You need to trade who has Pokemon firered or leafgreen.
On four Island you will need a Pokemon that knows Surf.
No you will need Emerald or Pokemon Colosseum to trade you a Sudowoodo.
Registeel is not catch able in Pokemon LeafGreen. In order to get a Registeel you will need to trade for one from Pokemon Ruby or Sapphire.
Sadly, You can't catch Oddish in LeafGreen. You can need to trade it from FireRed.
you need to find it in the safari zone in area1.
You have to trade it from Firered/Leafgreen in Pokemon firered/leafgreen you can find zapdos in power plant, but you need surf to get there.
You can't in ruby you need to get one from leafgreen or firered.