Mirage 2000 was only used as a testbed for testing the Rafale's RBE-2 AESA radar.
Even as a testbed, it suffered from weight imbalance due to the radar.
https://www.key.aero/forum/modern-military-aviation/143722-would-dassault-be-more-successful-iif-it-kept-with-mirage-2000-instead-of-rafale