The full list of Island Scanner pokemon is...
71 - Victreebel
154 - Meganium
157 - Typhlosion
160 - Feraligatr
184 - Azumarill
230 - Kingdra
289 - Slaking
365 - Walrein
398 - Staraptor
405 - Luxray
407 - Roserade
464 - Rhyperior
468 - Togekiss
473 - Mamoswine
497 - Serperior
500 - Emboar
503 - Samurott
534 - Conkeldurr
542 - Leavanny
545 - Scolipede
576 - Gothitelle
579 - Reuniclus
601 - Klinklang
604 - Eelektross
609 - Chandelure
612 - Haxorus
635 - Hydreigon
681 - Aegislash
I'll note that you're actually getting the pre-evolutions in most of these cases - i.e. Chikorita, Honedge, Horsea, Vigoroth, etc. - but I only kept track based on full evolutions so that's how I've noted them above. Based on the GameFAQs chatter, you can pretty much nab one of these each day and if you're offered one you don't want on an island after submitting your QR codes, you can soft-reset, go to a different island and will be offered a different one. You'll then have an hour to track them down.