Use this apple script to migrate your files out of evernote and into notes.app.

evernote-migration.scpt

tell application "Evernote"
	
	set _Notebooks to every notebook
	
	repeat with _NoteBook in _Notebooks
		
		set _NoteBookName to name of _NoteBook
		
		set _Notes to every note of _NoteBook
		
		repeat with _Note in _Notes
			set _NoteTitle to (title of _Note)
			set _NoteText to (HTML content of _Note)
			set _NoteCDate to the creation date of _Note
			set _NoteMDate to the modification date of _Note
			tell application "Notes"
				tell account "iCloud"
					if not (exists folder _NoteBookName) then
						make new folder with properties {name:_NoteBookName}
					end if
				end tell
				if _NoteText is not missing value then
					log _Note
					set theNoteID to make new note in folder _NoteBookName with properties {name:_NoteTitle, body:_NoteText, creation date:_NoteCDate, modification date:_NoteMDate}
				end if
			end tell
		end repeat
	end repeat
end tell