Shin Super Robot Wars - Final Boss (Ghostelo)
Final Boss - Ghostelo, piloting the Original Devil Gundam. Ghostelo is from Layzner, and this is from the final "secret" stage where he is absorbed by the Devil Gundam. The term "OG Gundam" refers to this form of the robot, which is a little different than the one that Kyouji piloted.
Also, this isn't my save file. I got this from GameFAQs, credit to Duo Maxwell for uploading it.
Excuse the sound chopping, it happens because I was using an emulator to play the game. All sound plugins I tried had the same error.