The rock is a space rock which is a piece of a meteor fragment.
The transformation to Super Dino Mode is Sentai stock footage.
Anything featuring the actual shots of the Z-Rex Blaster is just
recycled Sentai footage.
Hydro Regenerator Rain Cloud is Sentai stock footage however once you
see Rojobot growing is when it goes back to regular Sentai footage.
Once you see the Brachiozord is when it goes back into Sentai stock
NOTE: All Sentai footage involving Rojobot comes from Abaranger 24 and
in the case of Rojobot, that just involves his Giant footage.