18+ Gigantamax Inteleon Gmax Background. While any pokémon can dynamax, only certain pokémon can gigantamax. It is a variant of dynamax;

Pokemon Sword and Shield: Galar Starter Gigantamax Forms ...
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This guide will show players how they can claim their own melmetal. Since inteleon earns its gigantamax form via max soup, that means you can have any inteleon you have earn its gigantamax form. While gigantamaxed, inteleon will extend its long tail and hold it straight as a pillar to take up a battle position at its top.

In addition to changing the pokémon's size, it changes its appearance as well.

While gigantamaxed, inteleon will extend its long tail and hold it straight as a pillar to take up a battle position at its top. With this move, inteleon will take aim from the top of its towering. Inteleon will take aim from on top of its towering tail, gathering water at its fingertip before blasting it. It has nictitating membranes over its eyes that allow it to precisely measure distance, temperature, humidity, and air pressure, culminating into incredible accuracy.