I would say Pokemon Blue because it was the very first video game (in general not just pokemon) i ever played

EDIT: and also it has a bunch of stuff to do in the game! I could never put it down!

I guess I'll say Crystal I admit it's ironic, I'm choising the newest game.

Gold

Yellow was my first and longest-played Pokémon title that I (through a long and kind of humorous story) actually have two imported copies of. It's my favorite just out of nostalgia.

I would say Silver, but Crystal was easily better than it. So I vote Crystal.

Silver by far.

Gold. Although Red was the first game I played, the game were I truly became a Pokemaniac was Gold.

My favorite was crystal. It was the first game that you can choose your genders.

I loved Crystal. Red was my first Pokemon game, but Crystal will always hold a place in my heart as my favorite Pokemon game. The Pokemon sprite animations are still better then the animations we see in today's games (in my opinion of course,) and Oak finally realized that his little Pokedex helpers didn't always have to be little prepubescent boys.

EDIT: Or perhaps Professor Elm was very strong about allowing girls to help Oak, and his traditional views on adventure. XD

Red it was my first pokemon game i EVER owned yes i'm that old school....Kanto Region where it all began....ah missingno good times....

Crystal's amazing, but I only had Red, Blue and Yellow, so I'll say Red. Yellow was the first I played, but I have the most memories of Red.

I can't decide between Yellow and crystal D:

I have to say Gold. It's the only Pokémon game that I've played so much that I've reached the clock limit.

Yellow isn't just my favorite for nostalgia. It's my favorite because it began my entire gaming career.

Despite that, I haven't come across any Pokemon posters to add to my ever expanding collection of other miscellaneous Nintendo posters that I have tacked to my walls. Oh, Nintendo Power. Why. Whyyy.

Seriously though.

Yellow was great. It was the penultimate game of the RBY trilogy (in truth, the RBGY quadrilogy), it had easter eggs from the anime (the Team Rocket trio of Jesse, James, and Meowth, Pikachu following you, Red's slight redesign to look a little bit more like Ash, Pikachu's modified cry, the fact your Pikachu refused to evolve... etcetera...), and just the fact that it was a plain old Pokemon game, with the classic formula of "Gotta catch 'em all!" and the player's drive to be a Pokemon master.

Yellow is easily one of the- if not THE- games that I've spent the most time on in my entire life.

And I STILL HAVE YET TO CATCH MEWTWO IN IT. I'll be back in a bit, guys, cowering in shame.

Crystal was wonderful. It had everything I would have wanted at that point from the games. Stuff now taken for granted like a legendary story that involves the character and their custom music, aswell as ability to travel back to Kanto won me over.

Crystal.<3
Even though I grew up with Gold, Crystal was just cooler and much more epic.

Silver.
Pokemon Blue might have been my first game, but silver was better and LUGIA FTW

I loved Crystal. Had me going for hours

My most favorite old Pokemon game is Pokemon Silver, I was so obsessed with the game when it first came out.

Being born in 1996, I wasn't introduced to Pokemon until around 2001, when I watched a whole bunch of episodes and watched the first two movies. But I figure that's old enough! But I was a late upbringer into the games.

My favorite game was the one I grew up with in elementary school, into middle, and soon high school, Pokemon Ruby. Loved that game, still have it! Sure, the internal battery's dried up now, but I play that game still!

Silver, definitely.

So many reasons why...

They're mostly listed in my Introduction to the forum. Foremost reason is being introduced to Terrorgatr, my lifetime PokePartner. :3

But also because I sort of consider Ecruteak my hometown. n.n I just love it so much.

crystal, because it seemed more than a gold and silver third version.

Crystal and stadium... those were the days...

My fav is Yellow

I loved my oldpokemon Red Version

Pokemon Red would be my favorite old game because it's my ONLY old game (I've never played G/S/C).

My first game was yellow, but with crystals 16 badges and suicune storyline plus the expansion on the r-g-b-y storyline it was the best in my opinion. Also my favorite game over all.

Crystal. They moved! They had color! Most of the sprites were from Gold...but that's ok! There was Eusine! And the cartridge was nice...transparent blue... why did they stop making color cartridges for the DS?