I know that only certain species of Pokémon can Gigantamax, and that among those species only certain individuals can.
As far as I've seen online, Pokémon capable of Gigantamaxing can only be obtained in Max Raid Battles or through events (like the Mystery Gift Meowth).
Is this correct? Is it impossible for a Pokémon caught in the wild outside of Max Raid Battles to be capable of Gigantamaxing?
Best Answer
TLDR: The Pokemon you find in the wild do not get the Gigantimax form and move that they would get if you caught them in a Max Raid Battle.
Although I'm sure you have already found this, here is a list of all Pokemon that have a unique Gigantimax form/move: https://www.ign.com/wikis/pokemon-sword-shield/List_of_Every_Gigantamax_Pokemon#Gigantamax_Drednaw
I can confirm that Pokemon caught in the wild cannot get the unique Gigantimax move since when I Dynamax my Corviknight that I raised from a Rookidee, it does not get the unique form/move just the default flying Dynamax move.
The real issue with this is the terminology Gigantimax. All Pokemon can become giant and get moves based on the types of their existing moves but not all Pokemon get the unique Gigantimax form or move even if it is the same species as the ones that have the unique form/move. I find it strange that they use the same terminologybut that may be a misunderstanding on my part.