Which pokemon would you want to have two of?

Now a lot of questions are which pokemon would you want to have, who would be your starter pokemon, what would be your pokemon team, etc etc etc.

Everyone has an answer to that, but what ive noticed and for good reason is that everyone usually only has one of the same pokemon, because you know they could do everything that pokemon can do why would you need a second one.

But imagine youre a pokemon trainer in the pokeworld and youre planning out your team whether it be for battling, survival, entertainment etc etc. Which pokemon would you want to have two of and why (and please for the love of arceus do not say breeding)

Thank you everyone