Route 35: 30 species in 3 games

Gold and Silver Crystal HeartGold and SoulSilver

Road 35: 30 species across 5 versions

Gold and SilverCrystalHeartGold and SoulSilver

Gold and Silver: 17 species
Species	Method	Levels	Chance	Game page
Caterpie	Headbutting a high encounter rate tree	10	50%	All places
Caterpie	Headbutting a low encounter rate tree	10	65%	All places
Caterpie	Headbutting a normal encounter rate tree	10	65%	All places
Metapod	Headbutting a low encounter rate tree	10	15%	All places
Metapod	Headbutting a normal encounter rate tree	10	15%	All places
Butterfree	Headbutting a high encounter rate tree	10	5%	All places
Butterfree	Headbutting a low encounter rate tree	10	5%	All places
Butterfree	Headbutting a normal encounter rate tree	10	5%	All places
Pidgey	Walking in tall grass or a cave	14	up to 5%	All places
Nidoran♀	Walking in tall grass or a cave	12	up to 30%	All places
Nidoran♂	Walking in tall grass or a cave	12	up to 30%	All places
Psyduck	Surfing	15 to 24	90%	All places
Golduck	Surfing	20 to 24	10%	All places
Poliwag	Fishing with a good rod	20	65%	All places
Poliwag	Fishing with an old rod	10	15%	All places
Poliwag	Fishing with a super rod	40	80%	All places
Abra	Walking in tall grass or a cave	10	up to 10%	All places
Drowzee	Walking in tall grass or a cave	14	up to 20%	All places
Exeggcute	Headbutting a high encounter rate tree	10	15%	All places
Exeggcute	Headbutting a low encounter rate tree	10	15%	All places
Exeggcute	Headbutting a normal encounter rate tree	10	15%	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
Ditto	Walking in tall grass or a cave	10	up to 5%	All places
Hoothoot	Walking in tall grass or a cave	14	5%	All places
Yanma	Walking in tall grass or a cave	12 to 14	up to 30%	All places
Pineco	Headbutting a high encounter rate tree	10	30%	All places

Crystal: 20 species
Species	Method	Levels	Chance	Game page
Pidgey	Walking in tall grass or a cave	14	up to 30%	All places
Nidoran♀	Walking in tall grass or a cave	12	up to 30%	All places
Nidoran♂	Walking in tall grass or a cave	12	up to 30%	All places
Jigglypuff	Walking in tall grass or a cave	12	up to 5%	All places
Meowth	Walking in tall grass or a cave	13	20%	All places
Psyduck	Surfing	15 to 24	90%	All places
Golduck	Surfing	20 to 24	10%	All places
Growlithe	Walking in tall grass or a cave	13	up to 20%	All places
Poliwag	Fishing with a good rod	20	65%	All places
Poliwag	Fishing with an old rod	10	15%	All places
Poliwag	Fishing with a super rod	40	80%	All places
Abra	Walking in tall grass or a cave	10	up to 10%	All places
Drowzee	Walking in tall grass or a cave	12	30%	All places
Exeggcute	Headbutting a high encounter rate tree	10	20%	All places
Exeggcute	Headbutting a low encounter rate tree	10	20%	All places
Exeggcute	Headbutting a normal encounter rate tree	10	20%	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
Ditto	Walking in tall grass or a cave	10	up to 5%	All places
Hoothoot	Headbutting a high encounter rate tree	10	50%	All places
Hoothoot	Headbutting a low encounter rate tree	10	50%	All places
Hoothoot	Headbutting a normal encounter rate tree	10	50%	All places
Hoothoot	Walking in tall grass or a cave	14	up to 30%	All places
Ledyba	Headbutting a low encounter rate tree	10	15%	All places
Ledyba	Headbutting a normal encounter rate tree	10	15%	All places
Spinarak	Headbutting a low encounter rate tree	10	15%	All places
Spinarak	Headbutting a normal encounter rate tree	10	15%	All places
Yanma	Walking in tall grass or a cave	12 to 14	up to 30%	All places
Pineco	Headbutting a high encounter rate tree	10	30%	All places
Snubbull	Walking in tall grass or a cave	12	up to 30%	All places

HeartGold and SoulSilver: 19 species
Species	Method	Levels	Chance	Game page
Pidgey	Walking in tall grass or a cave	14	up to 5%	All places
Nidoran♀	Walking in tall grass or a cave	12	up to 20%	All places
Nidoran♂	Walking in tall grass or a cave	12	up to 20%	All places
Psyduck	Surfing	10 to 25	90%	All places
Golduck	Surfing	15 to 31	10%	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
Abra	Walking in tall grass or a cave	10	10%	All places
Drowzee	Walking in tall grass or a cave	14	20%	All places
Exeggcute	Headbutting trees	10 to 14	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
Ditto	Walking in tall grass or a cave	10	4%	All places
Hoothoot	Headbutting trees	10 to 14	up to 50%	All places
Hoothoot	Walking in tall grass or a cave	14	5%	All places
Spinarak	Headbutting trees	13 to 14	30%	All places
Yanma	Walking in tall grass or a cave	12	up to 40%	All places
Pineco	Headbutting trees	10 to 11	30%	All places
Linoone	Walking in tall grass or a cave	14	20%	All places
Whismur	Walking in tall grass or a cave	12	20%	All places
Bidoof	Walking in tall grass or a cave	14	20%	All places
Buizel	Walking in tall grass or a cave	12	20%	All places