I think that's a pretty good idea. If that idea were to be implemented, everyone could use there favorite Pokemon as there main, without minding if it is NU or OU or something.
Also i heard a rumor about a "bond system" that if you train your Pokemon your bond will increase and if your bond is at its maximum it is fully ev/iv trained, and its ready for online battles, but that's only a rumor.
I'd love for the metagame to be balanced, but this isn't the way to do it. As stated before, many Pokemon are NU/RU/OU not just because of their stats. Movepools and typing play a huge part in the usefulness of a Pokemon. It would still lead to many Pokemon being unused simply because they have terrible moves/typing/stat distribution, thus creating tiers yet again.
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