The direct corner is located on the top floor of a Pokemon center to the far right. This can be used for trading and battling with another Game Boy Advance as long as you have a GBA link cable.
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You go to island 6, turn right at PC, go down the stairs and direct forward.
You can't.
All starters, including Bulbasaur, can't be caught in Pokemon LeafGreen.
If you trade Pokemon between leafgreen and ruby ruby will have your leafgreen Pokemon and leafgreen will have the ruby Pokemon both in the party they will not be sent to the PC unless you personally walk to the PC and do so.
No.