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Those recolours aren't the best of things, far from it. The mixes are simple and the trainer sprites well ... just suck to be honest, nothing special, as ^ said.
I noticed that, there is no real reason. It's a bit like renting on Emerald, you get rubbish movesets with everything, just makes it more of a challenge.
It all depends on which one you prefer. Any of them can beat the game, I have done it with all 5 before. Just choose your favourite one, just for god sake don't keep it as an Eevee. Check a faq for when Carvanha and Aron evolve.