#1. Bulbasaur - found in Pallet Town. 
#2. Ivysaur - evolved Bulbasaur (L16). 
#3. Venusaur - evolved Ivysaur (L36). 
#4. Charmander - found in Pallet Town. 
#5. Charmeleon - evolved Charmander (L16). 
#6. Charizard - evolved Charmeleon (L36). 
#7. Squirtle - found in Pallet Town. 
#8. Wartortle - evolved Squirtle (L16). 
#9. Blastoise - evolved Wartortle (L36). 
#10. Caterpie - found in Viridian Forest. 
#11. Metapod - evolved Caterpie (L7). 
#12. Butterfree - evolved Metapod (L10). 
#13. Weedle - found near Route 25. 
#14. Kakuna - evolved Weedle (L7). 
#15. Beedrill - evolved Kakuna (L10). 
#16. Pidgey - found everywhere! 
#17. Pidgeotto - evolved Pidgey (L18). 
#18. Pidgeot - evolved Pidgeotto (L36). 
#19. Rattata - found everywhere! 
#20. Raticate - evolved Rattata (L20). 
#21. Spearow - found almost everywhere! 
#22. Fearow - evolved Spearow (L20). 
#23. Ekans (R) - found almost everywhere! 
#24. Arbok (R) - evolved Ekans (L22). 
#25. Pikachu - only found near Routes 2 and 10. 
#26. Raichu - evolved Pikachu (requires Thunder Stone). 
#27. Sandshrew (B) - found almost everywhere! 
#28. Sandslash (B) - evolved Sandshrew (L22). 
#29. Nidoran - found near Route 22 and Safari Zone. 
#30. Nidorina - evolved Nidoran (L16). 
#31. Nidoqueen - evolved Nidorina (requires Moon Stone). 
#32. Nidoran - found near Route 22 and Safari Zone. 
#33. Nidorino - evolved Nidoran (L16). 
#34. Nidoking - evolved Nidorino (requires Moon Stone). 
#35. Clefairy - found near Celadon City, Mt. Moon and Cerulean City. 
#36. Clefable - evolved Clefairy (requires Moon Stone). 
#37. Vulpix (B) - found near Cinnabar Island, Routes 7 and 8. 
#38. Ninetales (B) - evolved Vulpix (requires Fire Stone). 
#39. Jigglypuff - found near Route 3. 
#40. Wigglytuff - evolved Jigglypuff (requires Moon Stone). 
#41. Zubat - found in most caves. 
#42. Golbat - evolved Zubat (L22). 
#43. Oddish (R) - found almost everywhere! 
#44. Gloom (R) - evolved Oddish (L21). 
#45. Vileplume (R) - evolved Gloom (requires Leaf Stone). 
#46. Paras - found near Mt. Moon and Safari Zone. 
#47. Parasect - evolved Paras (L24). 
#48. Venonat - found near Routes 12 through 15. 
#49. Venomoth - evolved Venonat (L31). 
#50. Diglett - found in Diglett’s Cave. 
#51. Dugtrio - evolved Diglett (L26). 
#52. Meowth (B) - found in Routes 5 through 8. 
#53. Persian (B) - evolved Meowth (L28). 
#54. Psyduck - found near Routes 24 and 25. 
#55. Golduck - evolved Psyduck (L33). 
#56. Mankey (R) - found in Routes 5 through 8. 
#57. Primeape (R) - evolved Mankey (L28). 
#58. Growlithe (R) - found in Routes 7 and 8, and Cinnabar Island. 
#59. Arcanine (R) - evolved Growlithe (requires Fire Stone). 
#60. Poliwag - found almost everywhere with water! 
#61. Poliwhirl - evolved Poliwag (L25). 
#62. Poliwrath - evolved Poliwhirl (requires Water Stone). 
#63. Abra - found near Celadon City and Routes 24 and 25. 
#64. Kadabra - evolved Abra (L16). 
#65. Alakazam - evolved Kadabra (must be traded to change). 
#66. Machop - found near Victory Road and Route 10. 
#67. Machoke - evolved Machop (L28). 
#68. Machamp - evolved Machoke (must be traded to change). 
#69. Bellsprout (B)- found almost everywhere! 
#70. Weepinbell (B)- evolved Bellsprout (L21). 
#71. Victreebell(B)- evolved Weepinbell (requires Leaf Stone). 
#72. Tentacool - found almost everywhere! 
#73. Tentacruel - evolved Tentacool (L30). 
#74. Geodude - found in Mt. Moon and Rock Tunnel. 
#75. Graveler - evolved Geodude (L25). 
#76. Golem - evolved Graveler (must be traded to change). 
#77. Ponyta - found near Cinnabar Island. 
#78. Rapidash - evolved Ponyta (L40). 
#79. Slowpoke - found almost everywhere! 
#80. Slowbro - evolved Slowpoke (L37). 
#81. Magnemite - found near Cerulean City and Route 10. 
#82. Magneton - evolved Magnemite (L30). 
#83. Farfetch’d - found near Vermillion City. 
#84. Doduo - found near Routes 16 through 18. 
#85. Dodrio - evolved Doduo (L31). 
#86. Seel - found near Cinnabar Island and Seafoam Island. 
#87. Dewgong - evolved Seel (L34). 
#88. Grimer - found near Cinnabar Island. 
#89. Muk - evolved Grimer (L38). 
#90. Shellder - found near Routes 6, 11, 19, 21. 
#91. Cloyster - evolved Shellder (requires Water Stone). 
#92. Gastly - found near Pokemon Tower. 
#93. Haunter - evolved Gastly (L25). 
#94. Gengar - evolved Haunter (must be traded to change). 
#95. Onix - found near Victory Road and Route 10. 
#96. Drowzee - found near Route 11. 
#97. Hypno - evolved Drowzee (L26). 
#98. Krabby - found almost everywhere! 
#99. Kingler - evolved Krabby (L28). 
#100. Voltorb - found near Route 9. 
#101. Electrode - evolved Voltorb (L30). 
#102. Exeggcute - found near Safari Zone. 
#103. Exeggutor - evolved Exeggcute (requires Leaf Stone). 
#104. Cubone - found near Pokemon Tower. 
#105. Marowak - evolved Cubone (L28). 
#106. Hitmonlee - found in Saffron City. 
#107. Hitmonchan - found in Saffron City. 
#108. Lickitung - found near Route 18. 
#109. Koffing - found near Cinnabar Island. 
#110. Weezing - evolved Koffing (L35). 
#111. Rhyhorn - found near Safari Zone. 
#112. Rhydon - evolved Rhyhorn (L42). 
#113. Chansey - found near Safari Zone and Cerulean City. 
#114. Tangela - found near Cinnabar Island and Route 21. 
#115. Kangaskhan - found near Safari Zone. 
#116. Horsea - found near most water zones. 
#117. Seadra - evolved Horsea (L32). 
#118. Goldeen - found almost everywhere! 
#119. Seaking - evolved Goldeen (L33). 
#120. Staryu - found near most water zones. 
#121. Starmie - evolved Staryu (requires Water Zone). 
#122. Mr. Mime - must trade with in-game character. 
#123. Scyther (R) - found near Safari Zone and Celadon City. 
#124. Jynx - found in Cerulean City (trade for Poliwhirl). 
#125. Electabuzz (R)- found in Power Plant. 
#126. Magmar (B) - foind near Cinnabar Island. 
#127. Pinsar (B) - found near Celadon City and Safari Zone. 
#128. Tauros - found near Safari Zone and Route 18. 
#129. Magikarp - found near most water zones. 
#130. Gyrados - evolved Magikarp (L20). 
#131. Lapras - found near Saffron City. 
#132. Ditto - found near Route 13 through 15, 23, 24 and Victory Road. 
#133. Eevee - found in Celadon City. 
#134. Vaporeaon - evolved Eevee (requires Water Stone). 
#135. Jolteon - evolved Eevee (requires Thunder Stone). 
#136. Flareon - evolved Eevee (requires Fire Stone). 
#137. Porygon - found in Celadon City. 
#138. Omanyte - found in Cinnabar Island. 
#139. Omastar - evolved Omanyte (L40). 
#140. Kabuto - found in Cinnabar City. 
#141. Kabutops - evolved Kabuto (L40). 
#142. Aerodactyl - found in Pokemon Tower. 
#143. Snorlax - found near Routes 12 and 16. 
#144. Articuno - found on Seafoam Island. 
#145. Zapdos - found in Power Plant. 
#146. Moltres - found on Victory Road. 
#147. Dratini - found near Celadon City. 
#148. Dragonair - evolved Dratini (L30). 
#149. Dragonite - evolved Dragonair (L55). 
#150. Mewtwo - found near Route 24 in the water cave (requires Master Ball and Final 4 completion)