This is a mixed of Dairanger mechas vs. Major Zaidosu from episode 40 and episode 48. Along with some aspects added here. Note: All clips in this were made by TOEI and belongs to TOEI. Also. "Van Darkholme, is that you?".
Yup!! MMPR was only able to adapt one of the fights against the generals. But even that one was butchered since it had both mechas in stock footage when it was really only fought by RyuseiOh/Red Dragon.