Can Pokemon consent?
Consent to what, exactly? I don’t think we have any instances of a Pokémon being able to make a binding legal agreement, and their trainers seem to act in loco parentis with respect to all decisions about their medical treatment. They clearly have the intellectual capacity to literally agree to do things, though. My impression is that human law treats them as being roughly analogous to children – but of course neither the games nor the anime spends a lot of time on legal minutiae. Procedural drama fan fiction about lawyers in the Pokémon universe…?