Alternative way of place Emacs.app to Applications directory

To have Emacs.app as an alias from /Applications (using Spotlight and Finder for instance), you can execute the following commands:

rm /Applications/Emacs
osascript -e 'tell application "Finder" to make alias file to POSIX file "/usr/local/opt/emacs-mac/Emacs.app" at POSIX file "/Applications"'

But please notice Alias usually ranked quite low in Spotlight, you can always copy Emacs.app from Homebrew directory to /Applications by hand if you like, you will need to do this copy every time after homebrew upgrade.