Ninetales is classified as the Fox Pokémon, and is listed as #38 in the National Pokédex. It evolves from Vulpix if you use a Fire Stone at any level. Some basic stats:
Height: 3'7.3" (1.1m)
Weight: 43.9 lb (19.9kg)
Gender ratio: ¼ male, ¾ female
Breeding Group: Field
Growth rate: Medium (1,000,000 EXP to level 100)
As a Fire-type, Ninetales takes half damage from Bug, Fairy, Fire, Grass, Ice, and Steel-type attacks. It takes double damage from Ground, Rock, and Water-type attacks. Ninetales's Fire-type attacks do double damage to Bug, Grass, Ice, and Steel-types, and half damage to Dragon, Fire, Rock, and Water-types.
Ninetales's name is a reference to the fact that it's a nine-tailed fox. The "tales" part, I've always thought, comes from the fact that its origin is from Japanese folklore. Ninetales has different names in different localizations:
Japanese: キュウコン (Kyuukon) [kyuu = nine, kon = grudge]
French: Feunard [feu = fire, renard = fox]
German: Vulnona [Vulpes = genus for foxes, nona = Latin for the ninth]
Korean: 나인테일 (Nainteil) [nine + tail]
Pokémon has always been full of terrible puns, and I always love seeing the ones they come up with for the other localizations. I think Vulnona is the most inventive out of all of these, but they're all really interesting. The "kon" in Kyuukon could also possibly be from the Japanese onomatopoeia for the sound foxes make... and now I'm morally obligated to link this, so I think it's time to end this page.