There are Pokemon around Oblivia that can be found by roaring. Here are some that I know.
Pichu - Kokona Village (near Booker's house)
Skiploom - Ratorato Path (west of Talga's house)
Cherrim - Ratorato Path (Gracidea field)
Turtwig - Ratorato Path (riverside)
Teddiursa - Milonda Highway (east of Old Mansion)
Sentret - Milonda Highway (a cliffside with 2 Mothim)
Togepi - Milonda Highway (near Asahi Ruins exit)
Chimchar - Hualdera Volcano (entrance)
Croconaw - Sobiana Highway (near Mt.Sorbelas entrance)
Cleffa - Kanal Ruins (the area where Politoed is found)
Marill - Silver Falls
