Sorry, but what's on Diamond stays away from Ruby.
Wait. That doesn't really make sense... Whatever.
So.
I'll 'draw' you a little diagram:
Pokemon ----> Pokemon
Ruby ----> Diamond
Basically, it's impossible to get pokemon, really from ANY ds game, to a GBA game. You can go the other way, though...
trade from Ruby/Sapphir trade from Ruby/Sapphir trade from Ruby/Sapphir trade from Ruby/Sapphir
You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.
no
you don't need a national pokedex to trade from ruby to leaf green. You have to get the gems the sapphire and the ruby in order to trade from leaf green to ruby. These are found in leaf green. (:
trade from ruby/sapphire
Bulbasaur is not in ruby you must TRADE him to get him
trade trade trade
Trade Trade from Leaf Green or Fire Red you have to trade it from fire red to sapphire to ruby to emerald!
Trade with Ruby.
Ruby/Sapphire/Leaf Green/Fire Red/and i think Emerald. if not, trade from emerald to Ruby/Sapphire, and from ruby/sapphire to leaf green. You need to have the Sapphire and Ruby before you trade. you get these after the elite four.
he's in mt cornet
If you want to trade to ruby or Sapphire you have to fine the ruby and the Sapphire on the seivi islands. If you just want to trade to leafgreen then you can trade at any time.