Roaming Hoenn: 2 species in 2 games

2 species, 3 versions

Sapphire and RubyEmerald

Ruby and Sapphire: 1 species
Species	Method	Levels	Chance	Game page
Latias	On any overworld patch of grass	40	25%	All places
Latias	On any overworld water tile	40	25%	All places

Emerald: 2 species
Species	Method	Levels	Chance	Game page
Latias	On any overworld patch of grass	40	25%	All places
Latias	On any overworld water tile	40	25%	All places
Latios	On any overworld patch of grass	40	25%	All places
Latios	On any overworld water tile	40	25%	All places