Mew is not the absolute best at anything, but is the ultimate swiss army knife pokemon; he can be kind of ok at almost anything. GP says he is worth considering as an ice attacker. He is also cute as a button in the arena. I had fun powering him up, but I wouldn't recommend it from purely pragmatic reasons.
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Mew worth the dust/RC?
Anyone max out or power up mew?
Mine is 15/10/13 ads
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I maxed mine out because it ended up being my RC dump when I was in a hurry during the last day of grinding my ranger medal and afterwards felt like rewarding myself. Haven't TM'd it to a useable moveset yet, I'm not comfortable with doing that with 15/25 TMs in my bag.
I figure I'll use it for giggles as a gym generalist every now and then but there isn't really anything that it could do that I don't have better pokemon for already.