Ruby and Sapphire was good. It was refreshing, because it came as a refreshing new gen for pokemon. Thats my opinion.
2nd for me. The world is huge! The gameplay is just right and it has all the familiar pokemon I used to love. Gotta catch 'em all! ^^
the yellow was my first pokemon. I was sad when there was no pokemon following you in gold and silver
I voted for both the 2nd and 4th generation. Gold/Silver were/are the greatest games I have ever played. Although many people will disagree with me, Diamond/Pearl added a certain amount of competitiveness to the great games with Wi-Fi.