Kindle Road: 18 species in 1 game

18 species, 2 versions

FireRed and LeafGreen

FireRed and LeafGreen: 15 species
Species	Method	Levels	Chance	Game page
Spearow	Walking in tall grass or a cave	30 to 32	25%	All places
Fearow	Walking in tall grass or a cave	36	10%	All places
Meowth	Walking in tall grass or a cave	31	10%	All places
Persian	Walking in tall grass or a cave	37 to 40	5%	All places
Psyduck	Fishing with a super rod	25 to 35	1%	All places
Psyduck	Walking in tall grass or a cave	34	5%	All places
Tentacool	Surfing	5 to 40	95%	All places
Tentacruel	Surfing	35 to 40	5%	All places
Geodude	Smashing rocks	5 to 30	95%	All places
Geodude	Walking in tall grass or a cave	31	10%	All places
Graveler	Smashing rocks	25 to 40	5%	All places
Ponyta	Walking in tall grass or a cave	31 to 34	30%	All places
Rapidash	Walking in tall grass or a cave	37 to 40	5%	All places
Horsea	Fishing with a good rod	5 to 15	80%	All places
Horsea	Fishing with a super rod	15 to 25	80%	All places
Seadra	Fishing with a super rod	25 to 35	4%	All places
Magikarp	Fishing with a good rod	5 to 15	20%	All places
Magikarp	Fishing with an old rod	5	100%	All places
Gyarados	Fishing with a super rod	15 to 25	15%	All places