Please review the Q&A Usage Guidelines, specifically point 1, "Read and search the manual before posting." Your question appears to be directly answered by rule R15, quoted below for reference:
<R15> Robots have one microcontroller. Robots must use ONLY one (1) VEX EDR Microcontroller.
a. Examples of VEX EDR Microcontrollers are the VEX RM® Cortex®-based Microcontroller (276-2194) and the V5 Robot Brain (276-4810).
b. Any other microcontrollers or processing devices are not allowed, even as non-functional decorations. This includes microcontrollers that are part of other VEX product lines, such as VEXpro,VEX RCR, VEX IQ, or VEX Robotics by HEXBUG; it also includes devices that are unrelated to VEX, such as Raspberry Pi or Arduino devices.