This is a listing of all the Pokemon that were introduced in the Sinnoh region.

Turtwig: A grass Pokemon that evolves into Grotle; this is a "starter Pokemon" for the Sinnoh region
Grotle: A grass Pokemon that evolves from Turtwig and can evolve into Torterra
Torterra: A grass / ground Pokemon that evolves from Grotle
Chimchar: A fire Pokemon that evolves into Monferno; this is a "starter Pokemon" for the Sinnoh region
Monferno: A fire / fighting Pokemon that evolves from Chimchar and can evolve into Infernape
Infernape: A fire / fighting Pokemon that evolves from Monferno
Piplup: A water Pokemon that evolves into Prinlup; this is a "starter Pokemon" for the Sinnoh region
Prinplup: A water Pokemon that evolves from Piplup and can evolve into Empoleon
Empoleon: A water / steel Pokemon that evolves from Prinplup
Starly: A normal / flying Pokemon that evolves into Staravia
Staravia: A normal / flying Pokemon that evolves from Starly and can evolve into Staraptor
Staraptor: A normal / flying Pokemon that evolves from Staravia
Bidoof: A normal Pokemon that evolves into Bibarel
Bibarel: A normal / water Pokemon that evolves from Bidoof
Kricketot: A bug Pokemon that evolves into Kricketune
Kricketune: A bug Pokemon that evolves from Kricketot
Shinx: An electric Pokemon that evolves into Luxio
Luxio: An electric Pokemon that evolves from Shinx and can evolve into Luxray
Luxray: An electric Pokemon that evolves from Luxio
Budew: A grass / poison Pokemon that evolves into Rosealia
Roserade: A grass / poison Pokemon that evolves from Rosealia
Cranidos: A rock Pokemon that evolves from a Skull Fossil and can evolve into Rampardos
Rampardos: A rock Pokemon that evolves from Cranidos
Shieldon: A rock / steel Pokemon that evolves from an Armor Fossil and can evolve into Bastiodon
Bastiodon: A rock / steel Pokemon that evolves from Shieldon
Burmy: A bug Pokemon that evolves into Wormadam or Mothim
Wormadam: A bug / grass or bug / ground or bug / steel Pokemon (depending on form) that evolves from Burmy
Mothim: A bug / flying Pokemon that evolves from Burmy
Combee: A bug / flying Pokemon that evolves into Vespiquen
Vespiquen: A bug / flying Pokemon that evolves from Combee
Pachirisu: An electric Pokemon that does not evolve
Buizel: A water Pokemon that evolves into Floatzel
Floatzel: A water Pokemon that evolves from Buizel
Cherubi: A grass Pokemon that evolves into Cherrim
Cherrim: A grass Pokemon that evolves from Cherubi
Shellos: A water Pokemon that evolves into Gastrodon
Gastrodon: A water / ground Pokemon that evolves from Shellos
Ambipom: A normal Pokemon that evolves from Aipom
Drifloon: A ghost / flying Pokemon that evolves into Drifblim
Drifblim: A ghost / flying Pokemon that evolves from Drifloon
Buneary: A normal Pokemon that evolves into Lopunny
Lopunny: A normal Pokemon that evolves from Buneary
Mismagius: A ghost Pokemon that evolves from Misdreavus
Honchkrow: A dark / flying Pokemon that evolves from Murkrow
Glameow: A normal Pokemon that evolves into Purugly
Purugly: A normal Pokemon that evolves from Glameow
Chingling: A psychic Pokemon that evolves into Chimecho
Stunky: A poison / dark Pokemon that evolves into Skuntank
Skuntank: A poison / dark Pokemon that evolves from Stunky
Bronzor: A steel / psychic Pokemon that evolves into Bronzong
Bronzong: A steel / psychic Pokemon that evolves from Bronzor
Bonsly: A rock Pokemon that evolves into Sudowoodo
Mime Jr.: A psychic Pokemon that evolves into Mr. Mime
Happiny: A normal Pokemon that evolves into Chansey
Chatot: A normal / flying Pokemon that does not evolve
Spiritomb: A ghost / dark Pokemon that does not evolve
Gible: A dragon / ground Pokemon that evolves into Gabite
Gabite: A dragon / ground Pokemon that evolves from Gible and can evolve into Garchomp
Garchomp: A dragon / ground Pokemon that evolves from Gabite
Munchlax: A normal Pokemon that evolves into Snorlax
Riolu: A fighting Pokemon that evolves into Lucario
Lucario: A fighting / steel Pokemon that evolves from Riolu
Hippopotas: A ground Pokemon that evolves into Hippowdon
Hippowdon: A ground Pokemon that evolves from Hippopotas
Skorupi: A poison / bug Pokemon that evolves into Drapion
Drapion: A poison / dark Pokemon that evolves from Skorupi
Croagunk: A poison / fighting Pokemon that evolves into Toxicroak
Toxicroak: A poison / fighting Pokemon that evolves from Croagunk
Carnivine: A grass Pokemon that does not evolve
Finneon: A water Pokemon that evolves into Lumineon
Lumineon: A water Pokemon that evolves from Finneon
Mantyke: A water / flying Pokemon that evolves into Mantine
Snover: A grass / ice Pokemon that evolves into Abomasnow
Abomasnow: A grass / ice Pokemon that evolves from Snover
Weavile: An ice / dark Pokemon that evolves from Sneasel
Magnezone: A steel / electric Pokemon that evolves from Magneton
Lickilicky: A normal Pokemon that evolves from Lickitung
Rhyperior: A ground / rock Pokemon that evolves from Rhydon
Tangrowth: A grass Pokemon that evolves from Tangela
Electivire: An electric Pokemon that evolves from Electabuzz
Magmortar: A fire Pokemon that evolves from Magmar
Togekiss: A normal / flying Pokemon that evolves from Togetic
Yanmega: A bug / flying Pokemon that evolves from Yanma
Leafeon: A grass Pokemon that evolves from Eevee
Glaceon: An ice Pokemon that evolves from Eevee
Gliscor: A ground / flying Pokemon that evolves from Gligar
Mamoswine: An ice / ground Pokemon that evolves from Piloswine
Porygon-Z: A normal Pokemon that evolves from Porygon2
Gallade: A psychic / fighting Pokemon that evolves from Kirlia
Probopass: A rock / steel Pokemon that evolves from Nosepass
Dusknoir: A ghost Pokemon that evolves from Dusclops
Froslass: An ice / ghost Pokemon that evolves from Snorunt
Rotom: A ghost / electric Pokemon that does not evolve
Uxie: A psychic Pokemon that does not evolve; this is a "Legendary Pokemon"
Mesprit: A psychic Pokemon that does not evolve; this is a "Legendary Pokemon"
Azelf: A psychic Pokemon that does not evolve; this is a "Legendary Pokemon"
Dialga: A steel / dragon Pokemon that does not evolve; this is a "Legendary Pokemon"
Palkia: A water / dragon Pokemon that does not evolve; this is a "Legendary Pokemon"
Heatran: A fire / steel Pokemon that does not evolve; this is a "Legendary Pokemon"
Regigigas: A normal Pokemon that does not evolve; this is a "Legendary Pokemon"
Giratina: A ghost / dragon Pokemon that does not evolve; this is a "Legendary Pokemon"
Cresselia: A psychic Pokemon that does not evolve; this is a "Legendary Pokemon"
Phione: A water Pokemon that does not evolve
Manaphy: A water Pokemon that does not evolve; this is a "Legendary Pokemon"
Darkai: A dark Pokemon that does not evolve; this is a "Legendary Pokemon"
Shaymin: A grass Pokemon that does not evolve; this is a "Legendary Pokemon"
Arceus: A normal Pokemon that does not evolve; this is a "Legendary Pokemon"