You can get the three legendary birds, Zapdos, Multrace, and Articuno. After you give the Ruby and sapphire to celio (on 1 island) you can go to the cerculean cave and catch Mew two. Now you can get one of the legendary dogs. If you start with Bulbasaur= Entei squirtle=Raikou charmander=sweecone. ( Sorry about spelling!!)
Moltres, zapados, and articuno are the three main legendaries in leaf green/fire red
there are 5 legendary Pokemon in leafgreen version
no but can in emerald!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Everything but preevolutions and legendaries.
If you mean with the 3 legendaries, the legendary bird pokémon Articuno, Zapdos and Moltres: you can't catch them in Diamond. You can migrate or trade them, since they will be roaming Sinnoh in Platinum. You can also find them in FireRed/LeafGreen, HeartGold/SoulSilver and X/Y.
You can not catch it in leafgreen,but in firered you can.
gameshark
Yes, lower their health so it is 1-5, then put them to sleep or confuse. Use ultra balls to catch.
Yes but the only one you can catch lugia
catch them
you cant get toros on leafgreen you need to catch one on firered and trade it to leafgreen
In total including event only Pokemon there are 10.