Route 19: 16 species in 1 game

Road 19: 16 species across 2 versions

X and Y

X and Y: 16 species
Species	Method	Levels	Chance	Game page
Arbok	Encountering 5 pokemon within grass, flowers, or within a cave	25	5%	All places
Poliwag	Fishing with an old rod	25	100%	All places
Poliwhirl	Fishing with a good rod	35	35%	All places
Poliwhirl	Fishing with a super rod	45	60%	All places
Weepinbell	Encountering 5 pokemon within grass, flowers, or within a cave	24	60%	All places
Weepinbell	Walking in purple flowers	46 to 47	20%	All places
Weepinbell	Walking in yellow flowers	48	10%	All places
Haunter	Walking in purple flowers	47	5%	All places
Haunter	Walking on rough terrain	47	5%	All places
Haunter	Walking in yellow flowers	47	5%	All places
Politoed	Fishing with a super rod	50	5%	All places
Quagsire	Walking in purple flowers	48	10%	All places
Quagsire	Walking on rough terrain	46 to 48	30%	All places
Quagsire	Surfing	46	50%	All places
Quagsire	Walking in yellow flowers	46 to 48	30%	All places
Gligar	Encountering 5 pokemon within grass, flowers, or within a cave	24	35%	All places
Barboach	Fishing with a good rod	35	65%	All places
Whiscash	Fishing with a super rod	45	35%	All places
Drapion	Walking in purple flowers	46 to 48	30%	All places
Drapion	Walking in yellow flowers	48	10%	All places
Carnivine	Walking in purple flowers	46 to 48	5%	All places
Carnivine	Walking on rough terrain	46 to 48	5%	All places
Carnivine	Walking in yellow flowers	46 to 48	5%	All places
Karrablast	Walking in purple flowers	47	10%	All places
Karrablast	Walking on rough terrain	47	10%	All places
Karrablast	Walking in yellow flowers	47	10%	All places
Shelmet	Walking in purple flowers	47	10%	All places
Shelmet	Walking on rough terrain	47	10%	All places
Shelmet	Walking in yellow flowers	47	10%	All places
Stunfisk	Walking on rough terrain	47 to 48	20%	All places
Stunfisk	Surfing	46 to 48	34%	All places
Sliggoo	Walking in purple flowers	48	10%	All places
Sliggoo	Walking on rough terrain	47 to 48	20%	All places
Sliggoo	Surfing	47 to 48	16%	All places
Sliggoo	Walking in yellow flowers	46 to 47	20%	All places