I'll give it one more try.
With an example from the real world.
If you give 1.000.000$ to everyone in the world, everyone would be a millionaire, but would it end poverty?
It wouldn't because every single product in the world would rise in price, and in the meantime even something like bread would probably end up costing 100.000$.
That said, including extremely unbalanced stuff would hurt the game in the long term.
It's not only about pvp, it's about the economy, it's about the events, it's about the gym reruns, the elite 4 reruns, it's about every single point in the game that could be affected.
So, is it worthy? Not really.
One of my favourite Pokémons ever is Groudon, would I like to have it? 100%. Will be good for the game? Probably not.