Route 3: 16 species in 1 game

Road 3: 16 species across 2 versions

X and Y

X and Y: 16 species
Species	Method	Levels	Chance	Game page
Pidgey	Walking in tall grass or a cave	4	10%	All places
Pikachu	Walking in tall grass or a cave	4 to 5	5%	All places
Goldeen	Fishing with a good rod	25	65%	All places
Seaking	Fishing with a super rod	35	35%	All places
Magikarp	Fishing with an old rod	15	100%	All places
Gyarados	Fishing with a super rod	35	60%	All places
Marill	Surfing	25 to 27	34%	All places
Dunsparce	Walking in tall grass or a cave	5	5%	All places
Masquerain	Surfing	25 to 27	66%	All places
Azurill	Walking in tall grass or a cave	5	10%	All places
Corphish	Fishing with a good rod	25	35%	All places
Crawdaunt	Fishing with a super rod	35	5%	All places
Bidoof	Walking in tall grass or a cave	3 to 4	20%	All places
Burmy	Walking in tall grass or a cave	5	10%	All places
Bunnelby	Walking in tall grass or a cave	3 to 4	20%	All places
Fletchling	Walking in tall grass or a cave	3 to 5	20%	All places