Pokémon Gold/Silver/Crystal

Pokemon Gold/Silver/Crystal was the second generation of handheldPokemon games, coming after Pokemon Red/Blue/Yellow and before Pokemon Diamond/Pearl.

GSC has been largely overshadowed by other generations, but it did surprise Board 8 by making the field of the 2004 Game Contest instead of RBY. However, that may not have been such a good thing, as it was promptly embarrassed by Xenogears in the first round.

Gold
What about Gold? It deserves some respect! It has a pretty bird on the cover!

Silver
Silver is better though. It has a better picture of Chikorita, therefore, Silver > Gold.

Crystal
This version features moving Pokemon. And it has Chikorita as a starter, which means its awesome.