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In Emerald, after beating the Elite 4, you can get access to an expanded Safari Zone that lets you have access to a bunch of GSC Pokemon: Sunkern, Mareep, Aipom, Spinarak, Hoothoot, Snubbull, Stantler, Gligar, Teddiursa, Ledyba, Pineco, Houndour, Miltank, Wooper, Marill, Remoraid, and Shuckle
If you complete the Hoenn Dex and go to Prof. Birch you can get one of the GSC Starters: Chikorita, Cyndaquil, or Totodile.
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