I know there is not really a difference about the Pokémon’s stats, moveset, etc. but it would be really cool to actually be able to view a picture of the Pokémon’s Gigantamax form, exactly like how you would for Mega Evolution.
It already is viewable. Click on “Additional Artwork” under the Pokémon’s Sprite and there’s some artwork for that Pokémon’s Gigantimax form, like this: