Route 113: 4 species in 3 games

Road 113: 4 species across 5 versions

Ruby and SapphireEmeraldOmega Ruby and Alpha Sapphire

Ruby and Sapphire: 3 species, all by walking in tall grass or a cave
Species	Levels	Chance	Game page
Sandshrew	14 to 16	25%	All places
Skarmory	16	5%	All places
Spinda	14 to 16	70%	All places

Emerald: 3 species, all by walking in tall grass or a cave
Species	Levels	Chance	Game page
Slugma	14 to 16	25%	All places
Skarmory	16	5%	All places
Spinda	14 to 16	70%	All places

Omega Ruby and Alpha Sapphire: 2 species, all by encountering 5 pokemon within grass, flowers, or within a cave
Species	Levels	Chance	Game page
Skarmory	9	5%	All places
Spinda	9	95%	All places