Austin John plays here with how to catch pokemon using QR codes and the island pokemon scan. Doing this method you can catch:
Monday
Totodile Melemele Island Seaside Cave
Spheal Akala Island Route 7
Swinub Ula'ula Island Tapu Village
Conkeldurr Poni Island Poni Plains
Tuesday
Deino Melemele Island Ten Carat Hill
Luxio Akala Island Route 8
Duosion Ula'ula Island Route 16
Togekiss Poni Island Poni Plains (Togepi's Evolved Form)
Wednesday
Horsea Melemele Island Kala'e Bay
Honedge Akala Island Akala Outskirts
Roselia Ula'ula Island Ula'ula Meadow
Leavanny Poni Island Poni Meadow
Thursday
Klink Melemele Island Hau'oli City
Venipede Akala Island Route 4
Staravia Ula'ula Island Route 10
Serperior Poni Island Exeggutor Island (Snivy's Evolved form)
Friday
Chikorita Melemele Island Route 2
Bellsprout Akala Island Route 5
Vigoroth Ula'ula Island Route 11
Samurott Poni Island Poni Wilds (Oshawott's evolved form)
Saturday
Litwick Melemele Island Hau'oli Cemetery
Marill Akala Island Brooklet Hill
Axew Ula'ula Island Mount Hokulani
Emboar Poni Island Ancient Poni Path (Tepig's evolved form)
Sunday
Cyndaquil Melemele Island Route 3
Gothita Akala Island Route 6
Rhyhorn Ula'ula Island Blush Mountain
Eelektross Poni Island Poni Grove
After you Island scan pokemon go to their location to catch them.