Ooo, now I try to name all 151. In ORDER (well, as much as I can)

Bulbasaur
Ivysaur
Venusaur
Charmander
Charmeleon
Charizard
Squirtle
Wartortle
Blastoise
Caterpie
Metapod
Butterfree
Weedle
Kakuna
Beedrill
Pidgey
Pidgeotto
Pidgeot
Rattata
Raticate
Spearow
Fearow
Ekans
Arbok
Pikachu
Raichu
Sandshrew
Sandslash
Nidoran (Male)
Nidorino
Nidoking
Nodiran (Female)
Nidorina
Nidoqueen
Oddish
Gloom
Vileplume
Clefairy
Clefable
Vulpix
Ninetales
Jigglypuff
Wigglytuff
Zubat
Golbat
Paras
Parasect
Venonat
Venomoth
Diglett
Dugtrio
Meowth
Persian
Bellsprout
Weepinbell
Victreebel
Machop
Machoke
Machamp
Growlithe
Arcanine
Poliwag
Poliwhirl
Polywrath
Abra
Kadabra
Alakazam
Tentacool
Tentacruel
Geodude
Graveler
Golem
Mankey
Primeape
Ponyta
Rapidash
Slowpoke
Slowbro
Magnemite
Magneton
Voltorb
Electrode
Electabuzz
Duduo
Dodrio
Farfetch'd
Seel
Dewgong
Grimer
Muk
Shellder
Cloyster
Gastly
Haunter
Gengar
Onix
Krabby
Kingler
Exeggute
Exeggutor
Cubone
Marowak
Hitmonlee
Hitmonchan
Lickitung
Koffing
Weezing
Rhyhorn
Rhydon
Staryu
Starmie
Goldeen
Seaking
Magikarp
Gyarados
Aerodactyl
Kabuto
Kabutops
Omanyte
Omastar
Eevee
Jolteon
Flareon
Vaporeon
Chansey
Tangela
Kangaskhan
Scyther
Horsea
Seadra
Mr. Mime
Jinx
Magmar
Pinsir
Taros
Lapras
Ditto
Snorlax
Articuno
Zapdos
Moltres
Dratini
Dragonair
Dragonite
Mewtwo
Mew!

Wow. That was impressive (I think). And I didn't cheat. Somebody check me, I think I got all of them.

EDIT: I just remembered that I missed Psyduck and Golduck.