I know people are going to rip me to shreds, but my favorite generation is the first. There's so much sentimental value in the earliest main series Pokémon games, and I was happy when they were re-released to 3DS Virtual Console for #Pokémon20. Of course, I will admit there are TONS of crazy problems with that generation overall.
Outside of the above, I also enjoy Alpha Sapphire. The Hoenn remakes were so fun, especially compared to X/Y, even if I'm a bit miffed that Trainer Customization from X/Y didn't carry over into OR/AS, and that's something for me to say since I never played the original Generation III Hoenn entries.
Since I started with Pokemon Diamond, Omega Ruby was really fun as it was a big improvement on the originals from what I've seen and I had never played the originals either.
I know lot's of people were pretty upset that there wasn't character customization in ORAS and I think it was because the characters had to be the same as in the originals and in the originals character customization didn't exist aside from male and female which has been in every Pokemon game where as X and Y was a new game entirely so it didn't matter what they did as they didn't have to base the characters off of anything, so expect character customization to return in Sun and Moon.
I like Gen 6 the most because it's kinda the one i played more seriously as far as teambuilding goes. The others were just kind of having-fun-adventure generations for me.
Generation 3 is another favorite because it was my introduction to Pokémon when i got two Pokémon cards that were Cacturne and Crawdaunt. I thought they looked so awesome so i went to play Emerald a couple days later. Wich is also again why i love gen 6. The remakes!!!!
I like the font you used, do you use that for all your posts? I used to type every word starting with a capital letter on an old forum page before but I was told to stop as it hurt peoples eyes and could really damage people with epilepsy or something. I've gotten out of the habit know though so I won't be doing that ever again.