Oh for crying out loud! The Nine-tailed fox is part of Japanese legend! Each tail referring to every hundred years it lives (Was it hundreds? Someone correct me if I'm wrong)~!
The fox is taken from many legends, even the Native Americans have legends of the fox!
HOWEVER THE NINE-TAILED FOX ISN'T FROM DARN POKEMON! (as much as I do love Ninetails)
Does anyone even remember Tails from Sonic?! He had 2 tails!
Anywho, the more tails a fox gets, the more powerful they become.
But when the 9th tail grows, they become omniscient- aka, all-knowing.
The ability to know everything that happens across the world.
Most times, a 9-tailed fox is depicted as evil.
However, the legend is often misunderstood, as 9-tailed foxes could become guardians of the universe and watch over it. And for crying out loud, foxes protect the Inari Shrine! The friggin' rice shrine! And rice ain't evil! XD
If you're gonna accuse Naruto from taking from Pokemon and Pokemon for making up the idea, then you might as well say Okami took it from Pokemon as well!
Kitsune, Japanese word for fox, as Len Miyata pointed out, aren't just made up by some animes! They're part of Japan's history!
>_< For crying out loud, I'm a d*mn fox lover!