Bulbasaur #1
Ivysaur #2
Venusaur #3
Charmander #4
Charmeleon #5
Charizard #6
Squirtle #7
Wartortle #8
Blastoise #9
Caterpie #10
Metapod #11
Butterfree #12
Weedle #13
Kakuna #14
Beedrill #15
Pidgey #16
Pidgeotto #17
Pidgeot #18
Rattata #19
Raticate #20