gsc stands for gold silver and crystyl because they are all Pokemon games so gsc Pokemon are all Pokemon from Pokemon gold Pokemon silver and Pokemon crystyl and there it is you know the answer forever.
Gold / Silver / Crystal
Catching GSC Pokemon At The Safari ZoneAfter you defeated the Elite Four, go to the Upgraded Safari Zone. In the Safari, you can catch some GSC Pokemon such as Houndour, Aipom, Stantler, Mareep, Miltank, and more GSC Pokemon. This Unlockable works only in Pokemon Emerald.
Will likely be found in the same place as they were in GSC
You can get Pokemon from the Honnen and Kanto region, and after beating the Elite Four you can get certain GSC Pokemon.
Same reason you fight Red in GSC.
The population of SG-GSC is 12.
GSC Systems was created in 1984.
GSC Game World ended in 2011.
GSC Game World was created in 1995.
SG-GSC was created on 2000-06-18.
You don't get to see it on any game other than GSC/HGSS
Yes, it's a real Pokémon that you can get GSC and onwards. It evolves into Togetic and Togekiss.