Since a lot of you asked for this, I created a Dropbox account and uploaded it so that others could download it. This is an official map straight from Pokémon PR and depicts Pokémon Sun & Moon’s Alola Region in high-definition. It is 14,192px by 10,032px and 151mb so it may take awhile on some internet connections.
Download it here! (Dropbox suspended my ability to share files; moved the file to Mega now!)