You should have picked examples that are true. And as far as I know there is no benefit lost by catching a pokemon already evolved. But if you have anyone to trade with, I imagine they'd give it back if you just traded to evolve it.
I don't suffer from insanity; I enjoy every minute of it!
You won't have the benefits of those EVs of a Pokemon you had captured earlier in your journey on that fresh capture. Besides, train the earlier catch enough, and it'll evolve like the others.
Yeah, this guy's "opinion" is bunk. EVs work just the same whether you get them at level 1 or 100. You'll have to do just as much EV training either way, just less leveling with the already-leveled Pokemon - and leveling doesn't always correlate directly to evolution anyway.
As said before, the only thing you'll miss out by training a Pokemon caught fully-evolved and at a high level are moves learned only by the prevo.
Creator of Jay's Journey (see quote!) "It's not ten years old! Therefore, it sucks!" - Nostalgia whores everywhere