Bond Bridge: 19 species in 1 game

19 species, 2 versions

FireRedLeafGreen

FireRed: 14 species
Species	Method	Levels	Chance	Game page
Pidgey	Walking in tall grass or a cave	29 to 32	30%	All places
Pidgeotto	Walking in tall grass or a cave	34 to 40	15%	All places
Oddish	Walking in tall grass or a cave	31	20%	All places
Gloom	Walking in tall grass or a cave	36	10%	All places
Venonat	Walking in tall grass or a cave	34	5%	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	31	5%	All places
Tentacool	Surfing	5 to 40	95%	All places
Tentacruel	Surfing	35 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

LeafGreen: 14 species
Species	Method	Levels	Chance	Game page
Pidgey	Walking in tall grass or a cave	29 to 32	30%	All places
Pidgeotto	Walking in tall grass or a cave	34 to 40	15%	All places
Venonat	Walking in tall grass or a cave	34	5%	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
Bellsprout	Walking in tall grass or a cave	31	20%	All places
Weepinbell	Walking in tall grass or a cave	36	10%	All places
Tentacool	Surfing	5 to 40	95%	All places
Tentacruel	Surfing	35 to 40	5%	All places
Slowpoke	Fishing with a super rod	25 to 35	1%	All places
Slowpoke	Walking in tall grass or a cave	31	5%	All places
Krabby	Fishing with a good rod	5 to 15	80%	All places
Krabby	Fishing with a super rod	15 to 25	80%	All places
Kingler	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