Route 20: 8 species in 1 game

Road 20: 8 species across 2 versions

X and Y

X and Y: 8 species
Species	Method	Levels	Chance	Game page
Jigglypuff	Walking in red flowers	50	10%	All places
Jigglypuff	Walking in tall grass or a cave	48 to 49	20%	All places
Noctowl	Walking in red flowers	50	10%	All places
Noctowl	Walking in tall grass or a cave	48 to 50	30%	All places
Sudowoodo	Encountering 5 pokemon within grass, flowers, or within a cave	25	5%	All places
Zoroark	Walking in red flowers	48 to 50	5%	All places
Zoroark	Walking in tall grass or a cave	48 to 50	5%	All places
Gothorita	Walking in red flowers	48 to 50	30%	All places
Gothorita	Walking in tall grass or a cave	50	10%	All places
Foongus	Encountering 5 pokemon within grass, flowers, or within a cave	25	60%	All places
Amoonguss	Walking in red flowers	48 to 50	25%	All places
Amoonguss	Walking in tall grass or a cave	48 to 50	25%	All places
Trevenant	Encountering 5 pokemon within grass, flowers, or within a cave	25	40%	All places
Trevenant	Walking in red flowers	48 to 49	20%	All places
Trevenant	Walking in tall grass or a cave	50	10%	All places