Disclaimer: i dont work with the pokemon you stated much, especially the wobuffet. but i'll try my best to analyze them.
Wobuffet: It sounds alright, but if you can give him items i'd do HP up over defense/spec defense since HP will help in both.
I agree with the ninetales, except i dont like having nasty plot and other non attacking moves since they always seem to get me killed before i can adaquately use them [usually always get 2-3 shotted]. If they work for you, more power to you. I just hope his speed is quick to use them.
Neutral natured mew? depends on what you plan to use it for [a sweeper, or annoyance, or what have you] What matters as well as what level you got it in

usually most legendaries arent worth EV training when they are so high.