My favorite is gen. 2 and then gen. 1, so the remakes make quite a difference for me, cause without HeartGold and SoulSilver I would put gen. 4 last place :D
1.Gen 4
2.Gen 3
3.Gen 2
4.Gen 5
5.Gen 1
don't mind my username, that was more than 10 years ago, I'm a different person now, amazing how people change ^_^