I really love 4th gen due to the card designs on DP and HGSS! And I love BW due to the amazing cards and awesome Pokemon. Honestly, they were holding back on attack damage a lot in the first three gens. Now, with BW, 100 damage and up is becoming common. In the first two, getting a 50 damage card was lucky. I love the EX's in BW, I REALLY love the sets in B2W2. But for X and Y, I really feel a bit disappointed in the new Pokemon. Xerneas and Yveltal are great Pokemon, but it was just boring.
I WILL GIVE MY LIFE FOR 3RD GEN!!!, I would put 6th gen but even with all the amazing mutiplayer implements it doesn't make up the fact that the idea seemed overused and just was getting old it's been in the same format for 6 generations over the course of 19 years.
I chose 2nd, it's when I started playing the games. But as far as the show I choose first...
I chose first, third and sixth. I mean, Emerald was fun. I controlled an army of level 70+ Rayquaza. XY has a lot of new features and online battling with strangers is great. But I still have to stay loyal to Kanto, y'know?