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Well, I'd like to replace the Emerald player sprites (male/female) for the ones from Ruby/Sapphire. I tried looking for tools and info about sprites and how to extract them, but i couldn't work it out...
Unless you're talking about adding a sprite that didn't exist in Ruby/Saphire, such as the cooltrainer that speaks to you throughout Emerald, then Lexiicus is right, you probably should just change the palette. You can do that with the OverWorld Editor.