Route 8: 24 species in 1 game

Road 8: 24 species across 2 versions

X: 20 species
Species	Method	Levels	Chance	Game page
Tentacool	Surfing	25 to 27	69%	All places
Staryu	Fishing with a good rod	25	35%	All places
Starmie	Fishing with a super rod	35	5%	All places
Qwilfish	Fishing with a super rod	35	60%	All places
Taillow	Encountering 5 pokemon within grass, flowers, or within a cave	7	5%	All places
Wingull	Encountering 5 pokemon within grass, flowers, or within a cave	7	60%	All places
Wailmer	Surfing	25 to 27	31%	All places
Spoink	Walking in tall grass or a cave	13 to 14	20%	All places
Spoink	Walking in yellow flowers	15	10%	All places
Zangoose	Encountering 5 pokemon within grass, flowers, or within a cave	8	35%	All places
Zangoose	Walking in tall grass or a cave	14	10%	All places
Zangoose	Walking in yellow flowers	14	10%	All places
Seviper	Encountering 5 pokemon within grass, flowers, or within a cave	8	35%	All places
Absol	Walking in tall grass or a cave	15	10%	All places
Absol	Walking in yellow flowers	13 to 14	20%	All places
Luvdisc	Fishing with an old rod	15	100%	All places
Bagon	Walking in tall grass or a cave	14 to 15	5%	All places
Bagon	Walking in yellow flowers	14 to 15	5%	All places
Drifloon	Walking in tall grass or a cave	13 to 15	30%	All places
Drifloon	Walking in yellow flowers	15	10%	All places
Dwebble	Smashing rocks	18 to 20	66%	All places
Mienfoo	Walking in tall grass or a cave	15	10%	All places
Mienfoo	Walking in yellow flowers	13 to 15	30%	All places
Inkay	Walking in tall grass or a cave	14 to 15	15%	All places
Inkay	Walking in yellow flowers	14 to 15	15%	All places
Binacle	Smashing rocks	18 to 20	34%	All places
Clauncher	Fishing with a good rod	25	65%	All places
Clawitzer	Fishing with a super rod	35	35%	All places

Y: 20 species
Species	Method	Levels	Chance	Game page
Tentacool	Surfing	25 to 27	69%	All places
Shellder	Fishing with a good rod	25	35%	All places
Cloyster	Fishing with a super rod	35	5%	All places
Qwilfish	Fishing with a super rod	35	60%	All places
Taillow	Encountering 5 pokemon within grass, flowers, or within a cave	7	5%	All places
Wingull	Encountering 5 pokemon within grass, flowers, or within a cave	7	60%	All places
Wailmer	Surfing	25 to 27	31%	All places
Spoink	Walking in tall grass or a cave	13 to 14	20%	All places
Spoink	Walking in yellow flowers	15	10%	All places
Zangoose	Encountering 5 pokemon within grass, flowers, or within a cave	8	35%	All places
Seviper	Encountering 5 pokemon within grass, flowers, or within a cave	8	35%	All places
Seviper	Walking in tall grass or a cave	14	10%	All places
Seviper	Walking in yellow flowers	14	10%	All places
Absol	Walking in tall grass or a cave	15	10%	All places
Absol	Walking in yellow flowers	13 to 14	20%	All places
Luvdisc	Fishing with an old rod	15	100%	All places
Bagon	Walking in tall grass or a cave	14 to 15	5%	All places
Bagon	Walking in yellow flowers	14 to 15	5%	All places
Drifloon	Walking in tall grass or a cave	13 to 15	30%	All places
Drifloon	Walking in yellow flowers	15	10%	All places
Dwebble	Smashing rocks	13 to 15	66%	All places
Mienfoo	Walking in tall grass or a cave	15	10%	All places
Mienfoo	Walking in yellow flowers	13 to 15	30%	All places
Inkay	Walking in tall grass or a cave	14 to 15	15%	All places
Inkay	Walking in yellow flowers	14 to 15	15%	All places
Binacle	Smashing rocks	13 to 15	34%	All places
Skrelp	Fishing with a good rod	25	65%	All places
Dragalge	Fishing with a super rod	35	35%	All places