Pokémon Red version and Blue version were the initial two releases in the Pokémon series. You play as Red, a Pokémon trainer from Pallet Town who anime protagonist "Ash Ketchum" was later based on, and start a journey to become a Pokémon Master and ultimately catch 'em all.
Overview
Pokémon Red and Blue are the two initial releases of Nintendo's long-running Pokémon franchise. Developed by Game Freak, Red and Blue were the studio's first major successes; the company would eventually go on to create several direct sequels to the games for Nintendo's portable consoles the followed the Game Boy. Although the official number of Pokémon was often touted to be 150 in the games' marketing, the actual number of acquirable Pokémon was 151, albeit with the caveat that the additional creature couldn't be acquired through normal means.

Bulbasaur, the grass-type starter pokémon.
Storyline
The basic premise of Pokémon Red and Blue involves a nameable protagonist who sets off on a journey to thoroughly train, catch, trade, and ultimately master as many Pokémon as he can. After acquiring one of three Pokémon from Professor Oak; Bulbasaur, Squirtle, or Charmander, and then fighting a subsequent training battle with his rival, the main character sets off to explore the world to fulfill his goals. In order to achieve ultimate success, he must use his Pokémon team to fight and defeat eight Gym Leaders, specialists who each deal in a specific type of Pokémon, as well as the Elite Four and Gary Oak. Only after all of that has been achieved does the story technically end.
Gameplay Mechanics
Most Pokémon are acquired by "catching" them while they are still out and about in the wild. They can be found by the player simply roaming about in the Pokémons' native habitats, which usually happens by walking around in grass, swimming around in a body of water, or in other similar instances. Once a battle has been initiated, it is up to the player to weaken the wild Pokémon's Hit Points (HP) enough so that they can throw a Pokéball at them. Pokéballs are the containers which hold each trainer's Pokémon and as long as the wild Pokémon cannot break free from one, it can be freely used by the trainer who owns it. If a trainer's team is full at the time of the capture, the newly acquired Pokémon is then sent to a PC for storage and can be retrieved at a later point in time. Captured Pokémon can also be given nicknames, although doing so is optional.

Typical JRPG gameplay
Pokémon Red and Blue's battle system consists of gameplay mechanics which are common with many turn-based Japanese RPGs. Up to six Pokémon can be a part of a trainer's roster at any time, which is where the game's defining characteristics come into play. Since each Pokémon can have a different type (i.e: fire, water, electric, etc.) a system of strengths and weakness is employed, in addition to the standard calculations based on their individual statistics. Every attack is also assigned a type, which is also taken into consideration during battle. Although most Pokémon have limitations regarding which attacks they can learn, they are allowed to learn some which aren't the same as their type. No attack can be used an infinite number of times, though, as the amount of usage is dependent upon the amount of Power Points (PP) each attack has. These Power Points can be restored either through the use of specific items or by visiting a Pokémon Center, which is also used to fully heal a trainer's current roster of Pokémon.

Typical battle scene
As the Pokémon enter into battles and continue to win them, they gain experience points. Once they accumulate a specified amount, they level up, which serves two purposes. Leveling up your Pokémon in Red and Blue allows most Pokémon to learn new attacks which can be added to their arsenal, in addition to raising their individual statistics. However, because each Pokémon is limited to four different attacks, considerations must be made as they reach progressively higher levels. Leveling up also allows most Pokémon to evolve, enabling them to become a new species. The point at which each Pokémon may evolve is different depending on the species, although the trainer is allowed to prevent a Pokémon from doing so if they desire. One such advantage which comes from canceling an evolution is that more advanced and powerful attacks can be learned earlier if the Pokémon doesn't evolve, assuming the attack can still be learned in an evolved form.
With Pokémon, though, it is not always possible to evolve them via leveling up. In those instances, special stones can be given to the Pokémon to force them to evolve. The most famous Pokémon in the Red and Blue versions which are able to do this include Pikachu and Eevee, the latter of which has multiple evolutions depending on the stone applied. Some Pokémon still do not evolve in this manner, however, which is elaborated upon below.
Outside of battling, one of the defining traits of Pokémon Red and Blue is its trading feature. Because Red and Blue each have Pokémon which are exclusive to their individual versions, collecting all of the Pokémon requires trading with someone who owns the alternative version. Trading is done by connecting the two Game Boys via a link cable. Each person then decides which Pokémon they wish to trade and the duo's choices are transferred. With a few very specific Pokémon, the trading process allows them to evolve once the switching is complete. Although traded Pokémon are under the command of their new trainer, they still carry identification which indicates who originally had them.
Two linked Game Boys can also be used by trainers to battle one another. The majority of the rules which govern battle in the single-player game remain the same, although items cannot be used in linked battles. Skirmishes are otherwise the same, with a winner being declared once one trainer's entire team of Pokémon has fainted.

Venusaur, evolved form of Bulbasaur and Ivysaur.
Pokémon List
- Bulbasaur
- Ivysaur
- Venusaur
- Charmander
- Charmeleon
- Charizard
- Squirtle
- Wartortle
- Blastoise
- Caterpie
- Metapod
- Butterfree

Charizard, evolved form of Charmander and Charmeleon
- Weedle
- Kakuna
- Beedrill
- Pidgey
- Pidgeotto
- Pidgeot
- Rattata
- Raticate
- Spearow
- Fearow
- Ekans - Red version only
- Arbok - Red version only
- Pikachu
- Raichu
- Sandshrew - Blue version only

Blastoise, evolved form of Squirtle and Wartortle.
- Sandslash- Blue version only
- Nidoran♀
- Nidorina
- Nidoqueen
- Nidoran♂
- Nidorino
- Nidoking
- Clefairy
- Clefable
- Vulpix - Blue version only
- Ninetales - Blue version only
- Jigglypuff
- Wigglytuff
- Zubat

Butterfree, evolved form of Caterpie and Metapod.
- Golbat
- Oddish - Red version only
- Gloom - Red version only
- Vileplume - Red version only
- Paras
- Parasect
- Venonat
- Venomoth
- Diglett
- Dugtrio
- Meowth - Blue version only
- Persian - Blue version only
- Psyduck
- Golduck

Pidgeot, evolved form of Pidgey and Pidgeotto
- Mankey - Red version only
- Primeape - Red version only
- Growlithe - Red version only
- Arcanine - Red version only
- Poliwag
- Poliwhirl
- Poliwrath
- Abra
- Kadabra
- Alakazam
- Machop
- Machoke
- Machamp
- Bellsprout - Blue version only

Sandslash, evolved form of Sandshrew.
- Weepinbell - Blue version only
- Victreebel - Blue version only
- Tentacool
- Tentacruel
- Geodude
- Graveler
- Golem
- Ponyta
- Rapidash
- Slowpoke
- Slowbro
- Magnemite
- Magneton
- Farfetch'd

Raichu, after evolving Pikachu with a thunderstone.
- Doduo
- Dodrio
- Seel
- Dewgong
- Grimer
- Muk
- Shellder
- Cloyster
- Gastly
- Haunter
- Gengar
- Onix
- Drowzee
- Hypno
- Krabby

Nidoking, evolved form of Nidoran male and Nidorino after using a moonstone.
- Kingler
- Voltorb
- Electrode
- Exeggcute
- Exeggutor
- Cubone
- Marowak
- Hitmonlee
- Hitmonchan
- Lickitung
- Koffing
- Weezing
- Rhyhorn
- Rhydon
- Chansey
- Tangela

Alakazam, evolved form of Abra and Kadabra.
- Kangaskhan
- Horsea
- Seadra
- Goldeen
- Seaking
- Staryu
- Starmie
- Mr. Mime
- Scyther - Red version only
- Jynx
- Electabuzz - Red version only
- Magmar - Blue version only
- Pinsir - Blue version only
- Tauros

Onix has no evolutions in this game but is rock-type like Golem
- Magikarp
- Gyarados
- Lapras
- Ditto
- Eevee
- Vaporeon
- Jolteon
- Flareon
- Porygon
- Omanyte
- Omastar
- Kabuto
- Kabutops
- Aerodactyl
- Snorlax
- Articuno
- Zapdos
- Moltres
- Dratini
- Dragonair
- Dragonite
- Mewtwo
- Mew - Nintendo Download Only without utilizing a glitch.
Pokémon Gyms
During the adventure you'll have to face 8 different gym leaders and beat them to acquire their badges, and with them, get allowed into Victory Road and reach Indigo Plateau for the Elite. Each Pokémon Gym Leader is an specialist in some Pokémon type, it's important to notice thetypr for better chances of counter-attacking with a strong type Pokémon. Here are the gym leaders, their location, their specialty and Pokémons used.
Pewter City Gym
Leader - Brock
Badge - Boulder Badge
Pokémon Type - Rock/Ground
Pokémon Used - Geodude, Onyx
Cerulean City Gym
Leader - Misty
Badge - Cascade Badge
Pokémon Type - Water
Pokémon Used - Staryu, Starmie
Vermilion City Gym
Leader - Lt. Surge
Badge - Thunder Badge
Pokémon Type - Electric
Pokémon Used - Pikachu, Voltorb, Raichu
Celadon City Gym
Leader - Erika
Badge - Rainbow Badge
Pokémon Type - Grass
Pokémon Used - Tangela, Victreebel, Vileplume
Saffron City Gym
Leader - Sabrina
Badge - Marsh Badge
Pokémon Type - Psychic
Pokémon Used - Kadabra, Alakazan, Mr. Mime, Venomoth
Fuchsia City Gym
Leader - Koga
Badge - Soul Badge
Pokémon Type - Bug/Poison
Pokémon Used - Koffing, Koffing, Muk, Weezing
Cinnabar City Gym
Leader - Blaine
Badge - Volcano Badge
Pokémon Type - Fire
Pokémon Used - Growlithe, Rapidash, Arcanine, Ponyta
Viridian City Gym
Leader - Giovanni
Badge - Earth Badge
Pokémon Type - Ground
Pokémon Used - Dugtrio, Rhyhorn, Nidoking, Nidoqueen, Rhydon
The Elite Four
The very four best Pokémon trainers are the ultimate challenge for this game, you have to beat them all along with the current Pokémon Champion to achieve your goal of becoming the greatest Pokémon trainer.
Elite Four Lorelei
Pokémon Type - Water/Ice
Pokémon Used - Dewgon, Cloyter, Slowbro, Jynx, Lapras
Elite Four Bruno
Pokémon Type - Fighting
Pokémon Used - Onyx, Hitmonchan, Hitmonlee, Machamp, Onyx
Elite Four Agatha
Pokémon Type - Ghost
Pokémon Used - Gengar, Golbat, Hunter, Arbok, Gengar
Elite Four lance
Pokémon Type - Dragon/Flying
Pokémon Used - Gyarados, Dragonair, Dragonair, Aerodactyl, Dragonite
Elite Four Champion Gary Oak (Rival)
Pokémon Type - Gary has a very balanced team
Pokémon Used - Gary's Pokémon for the final battle will depend on which Pokémon he chose at the Professor Oak's lab. HIs choice will depend on yours, whatever Pokémon you choose, he will choose the Pokémon with a stronger type against yours, for example, if you choose Bulbasaur he will choose Charmander because fire is naturally strong against grass. Here are the three sets of Pokémon he might be using depending on the last evolution of the Pokémon he chose at the lab in the beginning of the game:
With Venusaur - Pidgeot, Alakazan, Rhydon, Arcanine, Gyarados
With Blastoise - Pidgeot, Alakazan, Rhydon, Exeggutor, Arcanine
With Charizard - Pidgeot, Alakazan, Rhydon, Gyarados, Exeggutor

MissingNo.
MissingNo.
Easily the most famous Pokemon glitch of all time, MissingNo. is a buggy Pokemon which, if caught, can make all kinds of crazy stuff happen in the game.
To catch a MissingNo was a very simple process. In the town with the final gym you are to talk to the old man who teaches you to catch pokemon. You must talk to him three time and when he asks you if you want to learn to catch pokemon you must say no the first two times and then say yes the third. After you watch him catch a weedle then fly to Cinnibar Island and surf on the right edge of the island and don't leave the edge. Once a pokemon battle happens you can run into a MissingNo or one of the glitched pokemon over level 100.
Some weird things that will happen to your game when you catch a MissingNo is that the item in your 6th item slot will be duplicated to over 99. Also when you go to check your battle history of the Elite Four it wil be all glitched. If MissingNo gains one level the he will evolve into a level 1 Kangaskhan.
PokeGods
Along with MissingNo there were always rumors about such pokemon called PokeGods. These pokemon were beleived to be obtainable in many ways but were never true.
Some rumored ways of getting these pokemon where to get access to Bill's Garden which was suppost to be a secret place behind Bill's hosue and you could catch many powerful pokemon there. Another rumored way was to get access to the PokeGods City. This was a place that would be accessable to you after you have beaten the Elite Four 50 times in a row without saving or healing, Professor Oak would saying something like "I'm getting tired of this" and let you roam around the ending area and you would find a ladder to the city. This is also not true.
The more viable option was the truck off to the side before you get on the S.S Ann. This was possible by finding a way to surf before acutally boarding the SS Ann. In the back of the truck were rumored to be a Mew and a Togepi. Togepi actually turned out to be a real pokemon in Silver and Gold. Another pokegod that turned out to be real was Pikablu. This pokemon turned out to be Marill, the little blue water pokemon.
Some of the PokeGods were rumored to be the names listed below (this is only a few of the many pokegods):
- Charcolt
- Rainer
- Sapusaur
- Locustud
- Mewthree
- Pikablu
- Chrono Mew
- Sandswipes
- Nidogodess
Some PokeGods were to be belived to evolve from already fully evolved pokemon using an item called a Mist Stone. But the Mist Stone was also another rumour that is not true.
Pokémon Green Version

Pokémon Green
Although it is commonly believed that the first releases in the Pokémon series were Pokémon Red and Pokémon Blue, the Blue version of the game actually made its debut under a different title and was known as Pokémon Green. The games were originally released in Japan as "Pocket Monsters Red" and "Pocket Monsters Green". Due to numerous glitches and bugs in these original versions of the game, they were amended and re-released as the more commonly known Red and Blue versions. Many of the sprites were also changed and there were some slight changes to the locations of wild Pokémon . These updated versions were later released in America and Europe, therefore the Green version was never released outside of Japan. Interestingly enough, when the games were remade and updated for the Game Boy Advance, Nintendo decided to reference the Green version rather than the Blue, and the new games were released as Pokémon FireRed and LeafGreen. One of the many glitches in the original Japanese releases of the game consisted of finding Pokémon in the wild that were only supposed to be obtainable at certain later stages in the game.