Well for me, I was kinda the same way with nostalgia.
When we only had 3 generations, I didn't like Gen 3 and I loved Gens 1 and 2.
Well then 4th and 5th Gens came along (played Gen 4 for the first time in 2011 at the same time B/W were released), and I realized that I didn't like the Pokemon from Gens 4 and 5, except a very few, and I started appreciating Gen 3 more.
Now the Pokemon from Gen 3 are probably my favorite.
Platinum FC: 3268 7322 8943
HeartGold FC: 3698 1539 4947
White 2 FC: 3612 1944 2721
3DS FC: 1779-0800-2195
My friend safari: Noibat, Gabite, Druddigon
Pokemon X National Dex: 717/718 (Only need JIRACHI)