U get all the Pokemon
you can't go to the johto region in pkmn ruby/Sapphire
you can only do that in Pokemon emerald
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Not any hoenn Pokemon but firered and leafgreen can catch alot of kanto and johto Pokemon ruby and sapphire can and can't.
Hoenn is the only accessible region in pokemon Ruby, Sapphire, and Emerald
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
You get a diploma in each, in emerald you can get a johto starter from prof birch and that's it.
Basically, -just- and I use the term loosely, obtain all Pokemon obtainable in Emerald/ruby/sapphire, on such games, then choose a johto starter (Birch will call you) and trade. Only way, sorry.