Petropia in the Ultimate timeline is the home to Evolved Petrosapiens and Evolved Petrotheras.
Nothing much has changed except for several mines and more underground cities.
When Sugilite was killed when protecting the planet, Petropia was invaded and the dominant species were forced underground. After a while, the Petropians were sick of cowering underground and started training for war. They evolved to become a lot more brutal and ready for war. The Petrotheras became more fierce and they just wanted their land back. The invaders left but more coming and coming.
The Petropians have made a liking to the underground land and have made several cities and on the surface, mines have been made to take the crystals to sell. Under the surface, a lot of broken pillars can be found because of Petropians training or fighting of Petrotheras.