If you already pay for a premium streaming tier, you can download "Rompe" for offline playback directly within the application. While this does not give you a raw MP3 file to move to other devices, it completely eliminates data usage.
To help me tailor any further music preservation tips, let me know: Daddy Yankee Rompe Download Mp3 Song
(Translation: "I want you to break everything that has to do with your past / I want you to come with me and leave all that behind") If you already pay for a premium streaming