List of mutually exclusive Pokémon

There are several mutually exclusive Pokémon in the games. In a given game, the player can get any Pokémon in a group of mutually exclusive Pokémon, but will be unable to obtain all of them in a single game without events or trading.

In the core series

Generation I

Pokémon Red and Blue

Starter Pokémon

In Pokémon Red and Blue, the starter Pokémon are mutually exclusive. In Pokémon Yellow, all three are available without trading.

Bulbasaur		Charmander		Squirtle
Grass	Poison	Fire		Water
	Ivysaur		Charmeleon		Wartortle
Grass	Poison	Fire		Water
	Venusaur		Charizard		Blastoise
Grass	Poison	Fire	Flying	Water

Pokémon Red, Blue, and Yellow

Hitmonlee and Hitmonchan

In Pokémon Red, Blue, and Yellow, the player chooses to receive either Hitmonlee or Hitmonchan from the master of the Fighting Dojo. It's not possible to acquire the other Pokémon outside of trades due to the lack of breeding in this generation.

Hitmonlee	Hitmonchan
Fighting	Fighting

Eeveelutions

There is a single Eevee available in Pokémon Red, Blue, and Yellow. It's not possible to acquire more than one Eeveelution outside of trades due to the lack of breeding in this generation.

Vaporeon	Jolteon	Flareon
Water	Electric	Fire

Omanyte and Kabuto

The player chooses either the Helix Fossil or Dome Fossil at the Mt. Moon, from which Omanyte or Kabuto is revived, respectively.

Omanyte		Kabuto
Rock	Water	Rock	Water
	Omastar		Kabutops
Rock	Water	Rock	Water

Generation II

Starter Pokémon

In Pokémon Gold, Silver, and Crystal, the only mutually exclusive Pokémon are the starter Pokémon.

Chikorita		Cyndaquil		Totodile
Grass		Fire		Water
	Bayleef		Quilava		Croconaw
Grass		Fire		Water
	Meganium		Typhlosion		Feraligatr
Grass		Fire		Water

Generation III

Pokémon Ruby, Sapphire, and Emerald

Starter Pokémon

In Pokémon Ruby, Sapphire, and Emerald, the starter Pokémon are mutually exclusive.

Treecko		Torchic		Mudkip
Grass		Fire		Water
	Grovyle		Combusken		Marshtomp
Grass		Fire	Fighting	Water	Ground
	Sceptile		Blaziken		Swampert
Grass		Fire	Fighting	Water	Ground

Pokémon Ruby and Sapphire

Lileep and Anorith

In Pokémon Ruby and Sapphire, the player is only able to acquire either the Root Fossil or Claw Fossil at the Route 111, from which Lileep or Anorith is revived, respectively. In Pokémon Emerald, both fossils are available: the first fossil in the Mirage Tower, the second in the Desert Underpass.

Lileep		Anorith
Rock	Grass	Rock	Bug
	Cradily		Armaldo
Rock	Grass	Rock	Bug

Pokémon Emerald

Johto starter Pokémon

If the player completes the Hoenn Pokédex in Pokémon Emerald, they may choose one of the three starter Pokémon from Johto as a prize given by Professor Birch.

Additionally, the three Johto starter Pokémon may be traded from Pokémon XD.

Chikorita		Cyndaquil		Totodile
Grass		Fire		Water
	Bayleef		Quilava		Croconaw
Grass		Fire		Water
	Meganium		Typhlosion		Feraligatr
Grass		Fire		Water

Eon duo

In Pokémon Emerald, a member of the Eon duo starts roaming Hoenn after the player enters the Hall of Fame, depending on the color of Pokémon that the player tells their Mom was on the TV at the start of the game. Red results in Latias roaming, while blue results in Latios roaming. The other Pokémon is available at the Southern Island if the player has the event-only Eon Ticket.

Latias		Latios
Dragon	Psychic	Dragon	Psychic

Pokémon FireRed and LeafGreen

Starter Pokémon

In Pokémon FireRed and LeafGreen, the starter Pokémon are mutually exclusive.

Bulbasaur		Charmander		Squirtle
Grass	Poison	Fire		Water
	Ivysaur		Charmeleon		Wartortle
Grass	Poison	Fire		Water
	Venusaur		Charizard		Blastoise
Grass	Poison	Fire	Flying	Water

Omanyte and Kabuto

The player chooses either the Helix Fossil or Dome Fossil at the Mt. Moon, from which Omanyte or Kabuto is revived, respectively.

Omanyte		Kabuto
Rock	Water	Rock	Water
	Omastar		Kabutops
Rock	Water	Rock	Water

Legendary beasts

One of the three Legendary beasts starts roaming Kanto after the player defeats Team Rocket in the Rocket Warehouse on Five Island and delivers the Sapphire to Celio. The Legendary beast depends on the type weakness of the player's chosen starter Pokémon: Raikou for Squirtle, Entei for Bulbasaur, or Suicune for Charmander.

Additionally, the three Legendary beasts may be traded from Pokémon Colosseum.

Raikou	Entei	Suicune
Electric	Fire	Water

Generation IV

Pokémon Diamond, Pearl, and Platinum

Starter Pokémon

In Pokémon Diamond, Pearl, and Platinum, the starter Pokémon are mutually exclusive.

Turtwig		Chimchar		Piplup
Grass		Fire		Water
	Grotle		Monferno		Prinplup
Grass		Fire	Fighting	Water
	Torterra		Infernape		Empoleon
Grass	Ground	Fire	Fighting	Water	Steel

Pokémon Platinum

Cranidos and Shieldon

In Pokémon Platinum, if the player's ID is an odd number, the Skull Fossil is available; if the ID is an even number, the Armor Fossil is available. Cranidos and Shieldon are resurrected from these fossils, respectively.

Cranidos		Shieldon
Rock		Rock	Steel
	Rampardos		Bastiodon
Rock		Rock	Steel

Pokémon HeartGold and SoulSilver

Starter Pokémon

In Pokémon HeartGold and SoulSilver, the starter Pokémon are mutually exclusive.

Chikorita		Cyndaquil		Totodile
Grass		Fire		Water
	Bayleef		Quilava		Croconaw
Grass		Fire		Water
	Meganium		Typhlosion		Feraligatr
Grass		Fire		Water

Kanto starter Pokémon

One of the Kanto starter Pokémon is given by Professor Oak after the player defeats Red.

Bulbasaur		Charmander		Squirtle
Grass	Poison	Fire		Water
	Ivysaur		Charmeleon		Wartortle
Grass	Poison	Fire		Water
	Venusaur		Charizard		Blastoise
Grass	Poison	Fire	Flying	Water

Hoenn starter Pokémon

One of the Hoenn starter Pokémon is given by Steven Stone after the player defeats Red.

Treecko		Torchic		Mudkip
Grass		Fire		Water
	Grovyle		Combusken		Marshtomp
Grass		Fire	Fighting	Water	Ground
	Sceptile		Blaziken		Swampert
Grass		Fire	Fighting	Water	Ground

Sinjoh Ruins

In Pokémon HeartGold and SoulSilver, the player is able to receive an Egg with a level 1 Dialga, Palkia, or Giratina in the Sinjoh Ruins event. This place is only accessible if the player has an Arceus from Pokémon Diamond, Pearl, and Platinum.

If the player has an Arceus from the Hall of Origin (which is not legitimately obtainable) and another Arceus from other event distributions, it's possible to receive 2 Eggs with Dialga, Palkia, or Giratina. It's not possible to receive 2 Eggs with the same Pokémon species in this way.

Dialga		Palkia		Giratina
Steel	Dragon	Water	Dragon	Ghost	Dragon

Generation V

Pokémon Black, Black 2, White, and White 2

Starter Pokémon

In Pokémon Black, White, Black 2, and White 2, the starter Pokémon are mutually exclusive.

Snivy		Tepig		Oshawott
Grass		Fire		Water
	Servine		Pignite		Dewott
Grass		Fire	Fighting	Water
	Serperior		Emboar		Samurott
Grass		Fire	Fighting	Water

Pokémon Black and White

Tirtouga and Archen

In Pokémon Black and White, the player chooses either the Cover Fossil or Plume Fossil at the Relic Castle, from which Tirtouga or Archen is revived, respectively.

Tirtouga		Archen
Water	Rock	Rock	Flying
	Carracosta		Archeops
Water	Rock	Rock	Flying

Generation VI

Pokémon X and Y

Starter Pokémon

In Pokémon X and Y, the starter Pokémon are mutually exclusive.

Chespin		Fennekin		Froakie
Grass		Fire		Water
	Quilladin		Braixen		Frogadier
Grass		Fire		Water
	Chesnaught		Delphox		Greninja
Grass	Fighting	Fire	Psychic	Water	Dark

Kanto Starter Pokémon

In Pokémon X and Y, one of the Kanto starter Pokémon is given by Professor Sycamore in Lumiose City.

Bulbasaur		Charmander				Squirtle
Grass	Poison	Fire				Water
	Ivysaur			Charmeleon			Wartortle
Grass	Poison	Fire				Water
	Venusaur			Charizard			Blastoise
Grass	Poison	Fire		Flying		Water
	Mega Venusaur		Mega Charizard X		Mega Charizard Y		Mega Blastoise
Grass	Poison	Fire	Dragon	Fire	Flying	Water

Tyrunt and Amaura

In Pokémon X and Y, the player chooses either the Jaw Fossil or Sail Fossil at the Glittering Cave, from which Tyrunt or Amaura is revived, respectively.

Tyrunt		Amaura
Rock	Dragon	Rock	Ice
	Tyrantrum		Aurorus
Rock	Dragon	Rock	Ice

Legendary birds

In Pokémon X and Y, one of the Legendary birds is found at the Sea Spirit's Den, depending on the Kalos starter Pokémon that was chosen by the player.

If the player chose Chespin, then Articuno will be available.
If the player chose Fennekin, then Zapdos will be available.
If the player chose Froakie, then Moltres will be available.

Articuno		Zapdos		Moltres
Ice	Flying	Electric	Flying	Fire	Flying

Pokémon Omega Ruby and Alpha Sapphire

Starter Pokémon

In Pokémon Omega Ruby and Alpha Sapphire, the starter Pokémon are mutually exclusive.

Treecko		Torchic		Mudkip
Grass		Fire		Water
	Grovyle		Combusken		Marshtomp
Grass		Fire	Fighting	Water	Ground
	Sceptile		Blaziken		Swampert
Grass		Fire	Fighting	Water	Ground
	Mega Sceptile		Mega Blaziken		Mega Swampert
Grass	Dragon	Fire	Fighting	Water	Ground