Minimum stats are calculated with 0 EVs, 0 IVs, and (if applicable) a hindering nature. Maximum stats are calculated with 252 EVs, 31 IVs, and (if applicable) a helpful nature.
Gigantamax Copperajah's Pokédex entries
So much power is packed within its trunk that if it were to unleash that power, the resulting blast could level mountains and change the landscape.
After this Pokémon has Gigantamaxed, its massive nose can utterly demolish large structures with a single smashing blow.