Route 21: 12 species in 1 game

Road 21: 12 species across 2 versions

X and Y

X and Y: 12 species
Species	Method	Levels	Chance	Game page
Poliwag	Fishing with an old rod	30	100%	All places
Poliwhirl	Fishing with a good rod	40	35%	All places
Poliwhirl	Fishing with a super rod	50	60%	All places
Scyther	Encountering 5 pokemon within grass, flowers, or within a cave	27	5%	All places
Scyther	Walking in purple flowers	50 to 52	10%	All places
Scyther	Walking in red flowers	50 to 52	10%	All places
Dratini	Fishing with a good rod	40	5%	All places
Dragonair	Fishing with a super rod	50	5%	All places
Ursaring	Walking in purple flowers	52	10%	All places
Ursaring	Walking in red flowers	50 to 52	40%	All places
Lombre	Surfing	50 to 52	66%	All places
Spinda	Encountering 5 pokemon within grass, flowers, or within a cave	26	60%	All places
Spinda	Walking in purple flowers	50 to 52	20%	All places
Spinda	Walking in red flowers	50 to 52	20%	All places
Swablu	Encountering 5 pokemon within grass, flowers, or within a cave	26	35%	All places
Altaria	Walking in purple flowers	50 to 51	20%	All places
Altaria	Walking in red flowers	50 to 51	20%	All places
Floatzel	Walking in purple flowers	50 to 52	40%	All places
Floatzel	Walking in red flowers	52	10%	All places
Floatzel	Surfing	50 to 52	34%	All places
Basculin	Fishing with a good rod	40	60%	All places
Basculin	Fishing with a super rod	50	35%	All places