Gold was the first Pokemon game I've ever played/owned. I loved everything about it. I was so shocked when I knew I could go back to Kanto. Sure, it wasn't "full" like people say, but I didn't play Red version until Crystal version was out. I liked GSC's Kanto better than RBY's. I liked how they took out those things from the previous version. I didn't have RBY to compare it to yet. After playing Red/Yellow, I still liked GSC's Kanto better. Even the new looks of old gym leaders. It made them look older.
Some extra things I liked:
Day and Night-A bird for day (Pidgey/Spearow) and a bird for night (Hoothoot)
16 badges-2 regions. No other game has that. It was awesome.
Battle with Red. (When I first played, I didn't know about RBY, so I thought it was Ash. XD Looked just like him.)
Radio-Pokegear- The only game that has Radio. I really liked the stations. Pokegear was my favorite gadget. It was simple, and didn't have so much junk added to it.
Favorite Starters-Chikorita was my first ever Pokemon. Love that thing.
Better Kanto (a lot of people said it was worse. I liked the new one much better.)
Great battle themes-Champion theme, rival theme, etc.
Best rival ever-he's the only rival who isn't a friend. He's cool. He stole a starter. I thought that was an awesome idea. He's the most unique rival. You felt good when you beat him. Also, it was funny when that guy at Lake of Rage says: some "____" guy made fun of my Pokemon. You could make his name a funny adjective and you would laugh. XD
Bug catching contests-I liked this better than the Safari zone. I was able to catch a BUTTERFREE/BEEDRILL there without having to level up a Caterpie/Weedle.
Magnet train-Favorite form of transportation. I liked it better than the boat.
Great music. (Especially Kanto's music.) Kanto had great Gym battle music.
Unique plot. The way it starts off is WAY different than any other Pokemon game. Liked that.
Awesome Legendaries-Ho-oh/Lugia are amazing. Best trio. Like them more than Mewtwo.
Gym Leaders are awesome.-Every Johto gym leader is awesome and unique. They also gave Kanto leaders makeovers. Misty has her hair down, Erika got a haircut. They made GARY(Blue) a gym leader! And they replaced Koga.
-The only Dragon Gym Leader-Clair. She was awesome.
There are so many things I love about this game. It was my first ever Pokemon game.