Nope. Gigantamax isn't inheritable, and can only be attainable if a Pokemon is caught at the stage it's Dynamaxable at.
For example, catching any Chewtle in a raid will never cause it evolve into a Gigantamaxable Drednaw. In addition, not every Drednaw you find in a raid will be Gigantmaxable...
Sirfetch'd is a held item evolution, but I'm not sure what that item is. I doubt it'll be the pre-existing Stick item as Galarian Farfetch'd has a 50% of holding one.
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