Primal Kyogre was fixated on the Giant Rock and was prepared to attack anyone who interfered. It was heavily reliant on Origin Pulse in battle and used Sheer Cold to transform the ocean into an icy wasteland to its own advantage.
It played a bigger role in Mega Evolution Special III, where it was shown in its primal state. As it made its way to the Giant Rock it left a trail of boiling magma behind it, making the area incredibly warm. It fought with Primal Kyogre over the Giant Rock and defeated Alain's Charizard. Primal Groudon was quickly defeated by Mega Rayquaza's Dragon Ascent and reverted to its normal form.