Route 42: 21 species in 3 games

Gold and Silver Crystal HeartGold and SoulSilver

Road 42: 21 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
Spearow	Walking in tall grass or a cave	14 to 16	up to 30%	All places
Zubat	Walking in tall grass or a cave	14 to 16	30%	All places
Mankey	Walking in tall grass or a cave	15	up to 30%	All places
Goldeen	Fishing with a good rod	20	65%	All places
Goldeen	Fishing with an old rod	10	15%	All places
Goldeen	Fishing with a super rod	40	70%	All places
Goldeen	Surfing	15 to 24	90%	All places
Seaking	Fishing with a super rod	40	10%	All places
Seaking	Surfing	20 to 24	10%	All places
Magikarp	Fishing with a good rod	20	35%	All places
Magikarp	Fishing with an old rod	10	85%	All places
Magikarp	Fishing with a super rod	40	20%	All places
Mareep	Walking in tall grass or a cave	13	up to 30%	All places
Flaaffy	Walking in tall grass or a cave	15 to 17	up to 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

Silver: 9 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
Spearow	Walking in tall grass or a cave	14 to 16	up to 40%	All places
Zubat	Walking in tall grass or a cave	14 to 16	40%	All places
Goldeen	Fishing with a good rod	20	65%	All places
Goldeen	Fishing with an old rod	10	15%	All places
Goldeen	Fishing with a super rod	40	70%	All places
Goldeen	Surfing	15 to 24	90%	All places
Seaking	Fishing with a super rod	40	10%	All places
Seaking	Surfing	20 to 24	10%	All places
Magikarp	Fishing with a good rod	20	35%	All places
Magikarp	Fishing with an old rod	10	85%	All places
Magikarp	Fishing with a super rod	40	20%	All places
Mareep	Walking in tall grass or a cave	13 to 15	up to 50%	All places
Flaaffy	Walking in tall grass or a cave	15 to 17	up to 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

Crystal: 14 species
Species	Method	Levels	Chance	Game page
Rattata	Walking in tall grass or a cave	13 to 15	up to 30%	All places
Raticate	Walking in tall grass or a cave	15 to 16	up to 20%	All places
Spearow	Headbutting a high encounter rate tree	10	50%	All places
Spearow	Headbutting a low encounter rate tree	10	65%	All places
Spearow	Headbutting a normal encounter rate tree	10	65%	All places
Spearow	Walking in tall grass or a cave	14	up to 30%	All places
Fearow	Walking in tall grass or a cave	16	up to 5%	All places
Ekans	Headbutting a low encounter rate tree	10	15%	All places
Ekans	Headbutting a normal encounter rate tree	10	15%	All places
Ekans	Walking in tall grass or a cave	13	up to 30%	All places
Arbok	Walking in tall grass or a cave	15	up to 5%	All places
Zubat	Walking in tall grass or a cave	14	30%	All places
Golbat	Walking in tall grass or a cave	16	up to 14%	All places
Goldeen	Fishing with a good rod	20	65%	All places
Goldeen	Fishing with an old rod	10	15%	All places
Goldeen	Fishing with a super rod	40	70%	All places
Goldeen	Surfing	15 to 24	90%	All places
Seaking	Fishing with a super rod	40	10%	All places
Seaking	Surfing	20 to 24	10%	All places
Magikarp	Fishing with a good rod	20	35%	All places
Magikarp	Fishing with an old rod	10	85%	All places
Magikarp	Fishing with a super rod	40	20%	All places
Marill	Walking in tall grass or a cave	15	5%	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

HeartGold: 14 species
Species	Method	Levels	Chance	Game page
Spearow	Headbutting trees	13 to 16	up to 80%	All places
Spearow	Walking in tall grass or a cave	14 to 16	up to 20%	All places
Zubat	Walking in tall grass or a cave	14 to 16	up to 20%	All places
Mankey	Walking in tall grass or a cave	15	up to 20%	All places
Goldeen	Fishing with a good rod	20	60%	All places
Goldeen	Fishing with an old rod	10	15%	All places
Goldeen	Fishing with a super rod	40	70%	All places
Goldeen	Surfing	10 to 25	90%	All places
Seaking	Fishing with a super rod	40	10%	All places
Seaking	Surfing	15 to 25	10%	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
Mareep	Walking in tall grass or a cave	13	up to 20%	All places
Flaaffy	Walking in tall grass or a cave	15 to 17	10%	All places
Aipom	Headbutting trees	13 to 16	up to 20%	All places
Heracross	Headbutting trees	13 to 14	30%	All places
Linoone	Walking in tall grass or a cave	14	20%	All places
Whismur	Walking in tall grass or a cave	13 to 15	20%	All places
Bidoof	Walking in tall grass or a cave	14	20%	All places
Buizel	Walking in tall grass or a cave	13 to 15	20%	All places

SoulSilver: 13 species
Species	Method	Levels	Chance	Game page
Spearow	Headbutting trees	13 to 16	up to 80%	All places
Spearow	Walking in tall grass or a cave	14 to 16	up to 30%	All places
Zubat	Walking in tall grass or a cave	14 to 16	up to 30%	All places
Goldeen	Fishing with a good rod	20	60%	All places
Goldeen	Fishing with an old rod	10	15%	All places
Goldeen	Fishing with a super rod	40	70%	All places
Goldeen	Surfing	10 to 25	90%	All places
Seaking	Fishing with a super rod	40	10%	All places
Seaking	Surfing	15 to 25	10%	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
Mareep	Walking in tall grass or a cave	13 to 15	up to 30%	All places
Flaaffy	Walking in tall grass or a cave	15 to 17	10%	All places
Aipom	Headbutting trees	13 to 16	up to 20%	All places
Heracross	Headbutting trees	13 to 14	30%	All places
Linoone	Walking in tall grass or a cave	15	20%	All places
Whismur	Walking in tall grass or a cave	13 to 14	20%	All places
Bidoof	Walking in tall grass or a cave	15	20%	All places
Buizel	Walking in tall grass or a cave	13 to 14	20%	All places