Pokeblocks can be made in the Pokemon contest buildings at cities such as Lilycove,Verandtruff..etc..so you really dont need a link cable..
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A berry that is used to make pokeblocks. See related link for more.
no you can only trade using a game boy to a game boy with the link cable.
You need gba link
Pokemon center. With a friend,using a wireless adapter or a link cable
You can trade from Pokemon Ruby to another Pokemon Ruby using a link cable.