Rooted Android Phone - Add Latest Google Play Store to System App for future factory reset
Download Google Play store here [ http://forum.xda-developers.com/showthread.php?t=1996995 ].
Install it from file manager by clicking APK file. Convert to System app via TitaniumBackup if you've already bought it as this feature is only available in PRO version. Or use this app [ https://play.google.com/store/apps/details?id=de.j4velin.systemappmover ] which is free. You can also move to /system/app folder manually and then set the right permission [and generate odex file] but using app to convert app to system app is safer option.