What is the highest grossing Malayalam film ever?

As of my last update in September 2021, the highest grossing Malayalam film ever is 'Lucifer', directed by Prithviraj Sukumaran and released in 2019. It reportedly earned over ₹200 crores (approximately $27.5 million) worldwide at the box office.

Please note that there may have been new releases or changes in box office standings after September 2021. For the most up-to-date information, I recommend checking reputable sources such as Box Office Mojo, IMDb, or official industry publications.