How do I display unsupported emoji on OS X Yosemite OS X Yosemite 10.10.5 by default can't display some emoji, for example the "Cloud with rain" emoji: .

How can I view such problematic emoji? Do I need to install a custom font?
I copied these two files from El Capitan and replaced the default ones (I recommend making backups):

/System/Library/Fonts/Apple Color Emoji.ttf
/System/Library/Input Methods/CharacterPalette.app/Contents/Resources/Category-Emoji.plist


After a reboot I have all emojis in Yosemite.