Route 45: 19 species in 3 games

Road 45: 19 species across 5 versions

Gold: 10 species
Species	Method	Levels	Chance	Game page
Spearow	Headbutting a high encounter rate tree	10	50%	All places
Spearow	Headbutting a low encounter rate tree	10	80%	All places
Spearow	Headbutting a normal encounter rate tree	10	80%	All places
Geodude	Walking in tall grass or a cave	23	30%	All places
Graveler	Walking in tall grass or a cave	23 to 27	40%	All places
Magikarp	Fishing with a good rod	20	90%	All places
Magikarp	Fishing with an old rod	10	100%	All places
Magikarp	Fishing with a super rod	40	60%	All places
Magikarp	Surfing	5 to 24	100%	All places
Dratini	Fishing with a good rod	20	10%	All places
Dratini	Fishing with a super rod	40	30%	All places
Dragonair	Fishing with a super rod	40	10%	All places
Aipom	Headbutting a high encounter rate tree	10	20%	All places
Aipom	Headbutting a low encounter rate tree	10	20%	All places
Aipom	Headbutting a normal encounter rate tree	10	20%	All places
Gligar	Walking in tall grass or a cave	24	20%	All places
Heracross	Headbutting a high encounter rate tree	10	30%	All places
Teddiursa	Walking in tall grass or a cave	20	10%	All places

Silver: 10 species
Species	Method	Levels	Chance	Game page
Spearow	Headbutting a high encounter rate tree	10	50%	All places
Spearow	Headbutting a low encounter rate tree	10	80%	All places
Spearow	Headbutting a normal encounter rate tree	10	80%	All places
Geodude	Walking in tall grass or a cave	23	30%	All places
Graveler	Walking in tall grass or a cave	23 to 25	55%	All places
Magikarp	Fishing with a good rod	20	90%	All places
Magikarp	Fishing with an old rod	10	100%	All places
Magikarp	Fishing with a super rod	40	60%	All places
Magikarp	Surfing	5 to 24	100%	All places
Dratini	Fishing with a good rod	20	10%	All places
Dratini	Fishing with a super rod	40	30%	All places
Dragonair	Fishing with a super rod	40	10%	All places
Aipom	Headbutting a high encounter rate tree	10	20%	All places
Aipom	Headbutting a low encounter rate tree	10	20%	All places
Aipom	Headbutting a normal encounter rate tree	10	20%	All places
Heracross	Headbutting a high encounter rate tree	10	30%	All places
Skarmory	Walking in tall grass or a cave	27	5%	All places
Phanpy	Walking in tall grass or a cave	20	10%	All places

Crystal: 12 species
Species	Method	Levels	Chance	Game page
Spearow	Headbutting a high encounter rate tree	10	50%	All places
Spearow	Headbutting a low encounter rate tree	10	80%	All places
Spearow	Headbutting a normal encounter rate tree	10	80%	All places
Geodude	Walking in tall grass or a cave	23	up to 30%	All places
Graveler	Walking in tall grass or a cave	23 to 27	up to 50%	All places
Magikarp	Fishing with a good rod	20	90%	All places
Magikarp	Fishing with an old rod	10	100%	All places
Magikarp	Fishing with a super rod	40	60%	All places
Magikarp	Surfing	5 to 24	100%	All places
Dratini	Fishing with a good rod	20	10%	All places
Dratini	Fishing with a super rod	40	30%	All places
Dragonair	Fishing with a super rod	40	10%	All places
Aipom	Headbutting a high encounter rate tree	10	20%	All places
Aipom	Headbutting a low encounter rate tree	10	20%	All places
Aipom	Headbutting a normal encounter rate tree	10	20%	All places
Gligar	Walking in tall grass or a cave	24	up to 20%	All places
Heracross	Headbutting a high encounter rate tree	10	30%	All places
Skarmory	Walking in tall grass or a cave	27	up to 5%	All places
Phanpy	Walking in tall grass or a cave	20	5%	All places
Donphan	Walking in tall grass or a cave	25 to 30	up to 15%	All places

HeartGold: 14 species
Species	Method	Levels	Chance	Game page
Spearow	Headbutting trees	23 to 27	up to 80%	All places
Poliwag	Fishing with a good rod	20	60%	All places
Poliwag	Fishing with an old rod	10	15%	All places
Poliwag	Fishing with a super rod	40	80%	All places
Geodude	Walking in tall grass or a cave	23	up to 20%	All places
Graveler	Walking in tall grass or a cave	23 to 27	up to 20%	All places
Magikarp	Fishing with a good rod	20	40%	All places
Magikarp	Fishing with an old rod	10	85%	All places
Magikarp	Fishing with a super rod	40	20%	All places
Magikarp	Surfing	2 to 25	100%	All places
Aipom	Headbutting trees	23 to 27	up to 20%	All places
Gligar	Walking in tall grass or a cave	24	20%	All places
Heracross	Headbutting trees	23 to 25	30%	All places
Phanpy	Walking in tall grass or a cave	20	10%	All places
Linoone	Walking in tall grass or a cave	24	20%	All places
Whismur	Walking in tall grass or a cave	23	20%	All places
Swablu	Walking in tall grass or a cave	23	40%	All places
Bidoof	Walking in tall grass or a cave	24	20%	All places
Buizel	Walking in tall grass or a cave	23	20%	All places

SoulSilver: 14 species
Species	Method	Levels	Chance	Game page
Spearow	Headbutting trees	23 to 27	up to 80%	All places
Poliwag	Fishing with a good rod	20	60%	All places
Poliwag	Fishing with an old rod	10	15%	All places
Poliwag	Fishing with a super rod	40	80%	All places
Geodude	Walking in tall grass or a cave	23	up to 20%	All places
Graveler	Walking in tall grass or a cave	23 to 25	up to 30%	All places
Magikarp	Fishing with a good rod	20	40%	All places
Magikarp	Fishing with an old rod	10	85%	All places
Magikarp	Fishing with a super rod	40	20%	All places
Magikarp	Surfing	2 to 25	100%	All places
Aipom	Headbutting trees	23 to 27	up to 20%	All places
Heracross	Headbutting trees	23 to 25	30%	All places
Teddiursa	Walking in tall grass or a cave	20	10%	All places
Skarmory	Walking in tall grass or a cave	27	5%	All places
Linoone	Walking in tall grass or a cave	24	20%	All places
Whismur	Walking in tall grass or a cave	23	20%	All places
Swablu	Walking in tall grass or a cave	23	40%	All places
Bidoof	Walking in tall grass or a cave	24	20%	All places
Buizel	Walking in tall grass or a cave	23	20%	All places