Ruby/Sapphire. Absolutely amazing, the first time the series had really decent graphics for its time, loads of new Pokemon, and it felt like a fresh change from the past while still being discernibly Pokemon. I loved new designs like Wailord, Tropius, Metagross and I even still have THE same Level 100 Kyogre from my 2003 imported US copy of Pokemon Sapphire which I moved across to Leaf Green (also an excellent remake in the same gen), to D/P, to Plat, to HG and now it resides on Black.
For the record my first game was Gold, but Ruby/Sapphire perfected things. Diamond/Pearl felt a little lacking in comparison, though Black/White is pretty good too.







