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So a lot of people, when selecting a team for competitive battling, will use certain Pokemon not because they're the most optimal for battling, but because they're their bros. That's fine and all, but what makes people think their bro Pokemon would be and should be just as viable as some of the other monsters in the OU tier?
If you have a pet, and if you don't, lets say you do, you love your pet right? Your pet is probably your best friend, but do you honestly think that the average dog or cat or hamster could take on something like a rhino or an elephant? This world has an entire ecosystem of animals, and the hard truth is that some animals are better able to survive and fight than others. That's the way nature works, and it would make sense for the Pokemon world to work similarly.