I'm not really big on some mons getting evos. I mean, some turned out great, like Weavile, Gligar, etc., but some pokes just really seem good the way they are. I hate to say it, but what do you do with Farfetch'd? I like having several non-viable pokes. Without them, there wouldn't be any backdrop against which to judge powerful pokemon. If every poke became viable, that would be incredibly boring. That's why people don't like later gens, there's much less variety.