If you somehow memorized the way outbreaks go, then put a chart like:
Route 10,Saturday Route 16,Sunday Route 12,Monday ect. ect.
This question might take long to answer, but no rush.
http://pokemondb.net/pokebase/30498/what-pokemon-are-there-in-outbreaks-in-pokemon-black
Already Asked.
I think you'll find the days that outbreaks occour are COMPLETELY random