You actually begin the game with the national dex.
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I don't think you can, in emerald you need the nationaldex and POW! it's open but in ruby and sapphire you can't.
You can fish for a lanturn after you get the nationaldex at route 220 with a super rod.
Pokemon Ruby has Pokemon that Pokemon Sapphire does not and Pokemon Sapphire has Pokemon that Pokemon Ruby does not.
You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.
Ok People Im Not Talking About Pokemon Ruby!! Just Pokemon Ruby Destiny!