1. Staryu
   Rattata
2. Pidgey
   Ekans

Rattata is one of the most common Generation 1 Pokemon in Red and Blue. They are found in a multitude of places from trails to caves to abandoned buildings.

1. Porygon
   Dratini
2. Zubat
   Sandslash

Sandslash is the evolve form of Sandshrew. It's a ground-type mouse Pokemon known for its powerful earthquake attack.

1. Haunter
   Snorlax
2. Cubone
   Doduo

Haunter is a powerful ghost-type Pokemon. It has the ability to travel through walls and uses its tongue to paralyze opponents.

1. Dugtrio
   Charizard
2. Aerodactyl
   Dragonite

In the anime, Charizard is one of Ash's strongest Pokemon. Ash is often forced to deal with Charizard's attitude, though, which can be quite poor unless it's motivated.

1. Sandshrew
   Vulpix
2. Paras
   Geodude

Geodude is a defense-based Pokemon with surprisingly strong attacks as well. However, the Pokemon is weak against water-types.

1. Pikachu
   Squirtle
2. Caterpie
   Clefairy

Over the years, Pikachu has become the face of the Pokemon franchise. Even today, Pikachu is displayed on everything from backpacks to phone cases.

1. Porygon
   Zubat
2. Dratini
   Nidoran

Zubat can be a pest if you're traveling through caves in Pokemon Red and Blue. They are well-known for poisoning your Pokemon which will drain their health if you don't seek medical attention.

1. Goldeen
   Flareon
2. Marowak
   Abra

In the anime, a Marowak mother is killed protecting her child from Team Rocket. After her death, the Marowak comes back as a ghost to look after her kid.

1. Parasect
   Diglett
2. Ninetails
   Poliwag

Ninetales is a fire-type Pokemon shrouded in mystery. Legend has it that Ninetales can live for 1,000 years.

1. Charmander
   Squirtle
2. Bulbasaur
   Nidoran

In the Pokemon anime, Ash has a habit of eventually letting his captured Pokemon go. However, he's always kept Bulbasaur around, though Bulbasaur mainly stays at Professor Oak's laboratory​.

1. Paras
   Jigglypuff
2. Meowth
   Bellsprout

In the anime, Team Rocket's Meowth can talk and is often the one scheming plans. Meowth usually leads Jessie and James in their pursuit of Ash's Pikachu.

1. Onix
   Poliwhirl
2. Hypno
   Voltorb

In Generation 1, Poliwhirl evolves into Poliwrath. In later Generations, however, it can also evolve into Politoed.

1. Spearow
   Ekans
2. Nidorina
   Oddish

Ekans' name comes from "snake" spelled backwards. The Pokemon is a favorite of Jessie's from Team Rocket.

1. Mankey
   Persian
2. Ninetales
   Arcanine

Arcanine is listed as a legendary Pokemon despite being more common than the other legendary Pokemon from Generation 1. There is little explanation for this, but a theory states that Arcanine was intended to be used in the place of Moltres, a legendary-bird Pokemon.

1. Magnemite
   Grimer
2. Diglett
   Krabby

Since it's burrowed in the ground, Diglett never shows the bottom part of its body. Fans have speculated that the Pokemon has feet because they are mentioned in the game Pokemon Mystery Dungeon, though they are never seen.

1. Seel
   Voltorb
2. Gloom
   Shellder

Seel only has one evolve form, Dewgong, which it reaches at level 34. When Seel evolves, it goes from a water-type to a water and ice-type Pokemon.

1. Kingler
   Snorlax
2. Hitmonlee
   Lickitung

Snorlax will fall asleep and block paths that you have to cross in Pokemon Red and Blue To get it to move, you have to play a flute which will awake the Pokemon and cause it to attack.

1. Primeape
   Golem
2. Seel
   Snorlax

Primeape is a very ill-tempered Pokemon. They are known for launching into fits of rage if you make eye contact with them.

1. Machamp
   Magneton
2. Slowbro
   Hypno

Machamp is pitched as the Pokemon that's mastered every type of martial arts. Its four arms make it deadly if it gets hold of an opponent.

1. Ponyta
   Tentacool
2. Slowpoke
   Psyduck

In the anime, Psyduck suffers from a constant headache and is always holding its head. The Pokemon has psychic powers that will activate by accident if its headache worsens.

1. Golbat
   Venonat
2. Gloom
   Ponyta

In Generation 1, Gloom evolves into Vileplume. Generation 2 introduced another evolve form for Gloom named Bellossom.

1. Hypno
   Krabby
2. Exeggutor
   Tentacruel

Tentacruel often uses its tentacles in battle, usually to constrict or bind its opponent. It's said that Tentacruel has a total of 80 tentacles that it can use at any time.

1. Kakuna
   Caterpie
2. Rattata
   Metapod

Kakuna's main method of fighting is to harden its shell to protect itself from attacks. It also uses poison attacks, which can be quite dangerous.

1. Goldeen
   Muk
2. Machoke
   Blastoise

Blastoise is the final evolve form of Squirtle, one of the three starter Pokemon. A water-type, hydro pump is its most powerful water attack.

1. Jolteon
   Slowbro
2. Vaporeon
   Flareon

Flareon is one of three evolve forms of Eevee. Depending on what type of stone you use, Eevee can also evolve into Vaporeon and Jolteon in Generation 1.

1. Rhydon
   Slowpoke
2. Koffing
   Horsea

Slowpoke is a water and psychic-type Pokemon. They are famous for hanging out along river banks where they use their tails to fish for food.

1. Nidoking
   Weezing
2. Rhydon
   Seadra

Nidoking is a ground and poison-type Pokemon. It's capable of learning a multitude of attacks from thunderbolt to blizzard.

1. Lapras
   Scyther
2. Jynx
   Shellder

A water-type Pokemon, Shellder has a unique relationship with Slowpoke. If a Shellder bites the tail of a Slowpoke, the Slowpoke will evolve into a Slowbro.

1. Pinsir
   Hypno
2. Ditto
   Kabuto

Throughout the different Pokemon games, Hypno has been depicted as a creepy Pokemon. For example, in Pokemon Gold, it apparently puts people to sleep then eats their dreams.

1. Staryu
   Tauros
2. Magneton
   Magmar

Magneton has a strong magnetic force that holds itself together. The magnetic force is strong enough to evaporate nearby water.

1. Lickitung
   Muk
2. Scyther
   Seaking

One of Lickitung's most obvious features is its large tongue. However, in the Generation 1 games, the Pokemon couldn't learn the move lick.

1. Kabuto
   Magikarp
2. Krabby
   Jynx

In the anime, Ash first uses Krabby against an Exeggutor during the first round of the Pokemon League Tournament. Krabby wins the match and immediately evolves into a Kingler.

1. Magmar
   Pinsir
2. Weezing
   Tangela

Weezing and its other evolution, Koffing, were supposed to be named La and Ny. Those names represented Los Angeles and New York, which were known for pollution.

1. Staryu
   Chansey
2. Doduo
   Abra

Staryu is one of Misty's Pokemon when you have to battle her in the second gym in Generation 1. She also has its evolved form Starmie, which is her strongest Pokemon.

1. Ponyta
   Magmar
2. Dragonite
   Moltres

In the anime, Magmar was the prized Pokemon of Cinnabar Island's gym leader Blaine. Magmar made his debut in the episode "Riddle Me This."

1. Bellsprout
   Goldeen
2. Spearow
   Onix

Brock is the first gym leader you come across in Pokemon Red and Blue. His most powerful Pokemon is Onix, who is difficult to defeat unless you have a water or grass-type Pokemon.

1. Dragonite
   Porygon
2. Fearow
   Golbat

Dragonite is a dragon Pokemon that evolves from Dragonair at level 55. However, according to the game measurements, Dragonair is nearly six feet taller than Dragonite.

1. Porygon
   Farfetchd
2. Vileplume
   Electabuzz

In Generation 1, Electabuzz is a standalone Pokemon with no evolved forms. However, it's given a lower evolved form, Elekid, in Generation 2 and a higher evolved form, Electivire, in Generation 4.

1. Porygon
   Pidgeot
2. Mewtwo
   Oddish

One of the most powerful Pokemon in the game, Mewtwo cannot be captured in Pokemon Red and Blue until you defeat the Elite Four. Once that's accomplished, you can find Mewtwo in the Cerulean Cave.

1. Moltres
   Articuno
2. Zapdos
   Aerodactyl

In Pokemon Red and Blue, players only have one opportunity to catch the legendary bird Pokemon. If they miss their opportunity, the Pokemon flies away, never to be heard from again.