use vs. seeker and amulet coin.
you cant go underwater in leafgreen!!
If you have caught it , you cant, But If you didin't Catch it , head to Dragonspiral Tower, It Should Be Waiting for you, If it faints, you can simply Beat the Elite 4 again.
cant, only on firered
you cant unless you trade
A lot
maby you have a old version of Pokémon LeafGreen and when it came out , the Cerulean Cave wasn't finished.
the ruby is in Mt. Ember you have to defeat the 2 rocket grunts in front of the entrance
cant
just use a good team.........i cant help you with that
You can you just to complete certain objectives: Beat the elite four in ruby, beat the elite four and get the national dex and deliver the ruby and sapphire to celio in leafgreen then at anytime go upstairs in any Pokemon center hook up a GBA to GBA cable to your GBA or GBASP's and talk to the lady behind the middle counter (for ruby) and the far right counter (for leafgreen) choose trade center for leafgreen ruby will automatically be there save the game and confirm the link with the A button and you will be in the trade center.
you get more money by selling items and beating pokemon trainers and the elite four and champion if you beat the elite four and champion or you don't have strong pokemon and you have rares i cant help you with that (I'm like that)
you cant
you can do about anything after you just cant beat the gym leaders again.
if you are playing firered/leafgreen you get to the elite 4 and beat them then you go to cerulean cave and catch mewtwo get it in your party then go to where you found mewtwo a bomb will go off and you have mew. sadly in heartgold/soulsilver you cant get except by migrating
You will need work with Lorelei on Island Four before you see will return to the Elite 4 making them challengeable again.
Yes, you cant go pass Nimbasa or Opelucid city until you beat the elite four, N, and ghestis.
beat the elite four and the champion