For me, it was Gold/Silver

Diamond/Pearl

ruby/sapphire

Gold/Silver. It was so more epic.

Gold/Silver/Crystal.

Gold/Silver was amazing. I still play it sometimes.

Pokemon Blue got me into the series but I like Diamond/Pearl the best.

Crystal. It was like Gold and Silver, but with moving characters.

Pokemon Blue

Gold/Silver

Damn, people really like Gold/Silver/Crystal...to me it wasn't that great.  Probably my least favorite out of all of them.  Well not crystal..but gold/sivler.

Yellow was where it was at back in the day :p

Crystal, though ruby/sapphire isn't far behind.

I feel that the best Pokemon games were either Red/Blue or Gold/Silver. The games after that were still very enjoyable but, in my opinion, felt a bit overbloated with features and newer Pokemon I found hard to care so much about.

I have yet to try out Fire Red/Leaf Green but maybe these games are superior as they might mix the simplicity of the first 150 Pokemon of Red/Blue with the larger feature lists of the later games. The test will be if it still includes Missingno.

I played Yellow and Crystal. Crystal is the better one technologically and content-wise, but Yellow was awesome for its time.

Red/Blue. Closely followed by Diamond/Pearl

I really can't just pick one, I guess Gold/Silver is probably my favourite, just.

I prefer the older games to the newer ones, just something isn't right with Diamond/Pearl. I think they should really freshen up the series with the next game.

Red and Blue were classics, I got Pearl but the old days of Pokemon were so much better

Red/Blue purely for the nostalgia.

Gold and silver may have been on a bigger and better scale but you just shouldn't forget your roots.

Silver, it was an enormous step up from Red and Blue.

Pokemon blue mothafucka.

Blue/Red/Yellow

As far as im concerned there are only 151 POKEMON!!!!!

Gold/Silver 16 badges plus face characters including Red from the previous games..

red/silvuh

yellow! I liked having pikachu follow me around.

Red. I remember going on long car rides and kicking ass.
 Seriously, I was in a kickboxing limo.

I remember spending hours upon hours a day on Blue. So blue.

Having played Diamond and LeafGreen, Blue remains my favourite in the series. That being said, I have Emerald and Gold tucked away waiting to be played, so the decision isn't as informed as it could be.

Fire Red as it brought back the fun of the classic but with up to the date visuals and stuff and Pearl because well, the more the better. I can't wait for the next generation one.

Original red or you fail.

Gold and Silver for sure. I was psyched for a new Pokemon experience, but who expects day and night cycles with breeding grounds and all the awesome other stuff to hit a handheld when they are in 3rd grade? It blew my mind. And was the most innovative release in the series adjusting for time/tech progress.

Red & Silver

Red and Ruby

Pokemon Snap and Red.

Diamond/Pearl, closely followed by Gold/Silver. I still have my hopes up that they'll remake the G/S/C generation games for the DS.

Diamond for me.

I would have to say Blue just because it was the game that got me hooked on the series. I never owned a GB...but after playing a friend's copy of Pokemon Red; I soon became to proud owner of my very own Gameboy. :)

yellow

Gold/Silver

The last one i played

Pokemon Gold and Emerald.

Pokemon Leaf Green

Gold/Crystal

God, i remember how much of a fan i was of those pokemon games as a kid xD

I prefer Red/Blue versions.

Pokemon Crystal, I remember the first time one of these crazy rare pokemon appeared. I nearly died.

Crystal all the way.

Silver, not even close. It fixed the imbalances of Red/Blue, offered twice as much gameplay, had an almost perfect lineup of monsters, and you got to fight Red at the very end! I really hope this one gets remade in the near future.

Blue.
Not red.
Blue.
Yeah that's right.

Gold/Silver for sure!