>>45203375The rest of the pokemon use the energy of Eternatus for this the red aura, Calirex uses his own energy from there his blue aura, and technically if he does not change shape that is a simple dinamax.
This seems a great resource for anime, since it would be foolish to face Eternatus with a Gigantamax/Dynamax form granted by Eternatus himself, on the other hand, if Calirex were the one who gave his support to the protagonists it would be more logical, a classic local vs visitor .
