This is the Death Egg Robot/Great Eggman Robo from the Sonic the Hedgehog 2 (2022) film, taking on the LegendaryVerse's incarnation of Mechagodzilla, with size equalized (assuming that one is smaller than the other).
Round I) Dr. Robotnik is empowered by the Master Emerald.
Round II) Dr. Robotnik no longer has the Master Emerald; the Death Egg Robot is running on its auxiliary power generator(s).