Pokemon & Locations.
#001 Bulbasaur - Can be chosen as a starter Pokemon in Pallet Town. (If not chosen, can only be obtained through trading.)
#002 Ivysaur - Evolves from Bulbasaur - Lv. 16
#003 Venusaur - Evolves from Ivysaur - Lv. 32
#004 Charmander - Can be chosen as a starter Pokemon in Pallet Town. (If not chosen, can only be obtained through trading.)
#005 Charmeleon - Evolves from Charmander - Lv. 16
#006 Charizard - Evolves from Charmeleon - Lv. 36
#007 Squirtle - Can be chosen as a starter Pokemon in Pallet Town. (If not chosen, can only be obtained through trading.)
#008 Wartortle - Evolves from Squirtle - Lv. 16
#009 Blastoise - Evolves from Wartortle - Lv. 36
#010 Caterpie - Viridian Forest, Route 25. Can also be found on Route 24 on Blue.
#011 Metapod - Evolve from Caterpie - Lv. 7. Can also be found in Viridian Forest & Route 25. Can be found on Route 24 on Blue.
#012 Butterfree - Evolve from Metapod - Lv. 10.
#013 Weedle - Viridian Forest, Route 24, 25
#014 Kakuna - Evolve from Weedle - Lv. 7. Can also be found in Viridian Forest, Route 24, 25
#015 Beedrill - Evolve from Kakuna - Lv. 10.
#016 Pidgey - Can be caught almost everywhere in Grass.
#017 Pidgeotto - Evolve from Pidgey Lv. 18. Can also be found on Route 14, 15, 21.
#018 Pidgeot - Evolve from Pidgeotto Lv. 32.
#019 Rattata - Can be caught almost everywhere in Grass.
#020 Raticate - Evolve from Rattata - Lv. 20. Can also be found on Route 16, 17, 18.
#021 Spearow - Route 3, 4, 16, 17, 18
#022 Fearow - Evolve from Spearow - Lv. 20. Can also be found on Route 17, 18, 23.
#023 Ekans - ONLY AVAILABLE ON RED. Route 4, 11, 23. If playing Blue version, Ekans is only obtainable through trade.
#024 Arbok - Evolve from Ekans - Lv. 22. Can also be found on Route 23, Cerulean Cave. (Only on Red)
#025 Pikachu - Viridian Forest, Power Plant
#026 Raichu - Evolve from Pikachu with a Thunder Stone. Can also be found in Cerulean Cave, and in the Power Plant on Blue.
#027 Sandshrew - ONLY AVAILABLE ON BLUE - Route 4, 11, 23. If playing Red version, Sandshrew is only obtainable through trade)
