Yeah it has unilimited chakra that's why Its the strongest bijuu
if u mean why do they both have nine tailed fox spirits then that is simple. It is because when the nine tailed fox came and wrecked everything it left huge amounts of chakra lying around everywhere. One guy named Kazuma (or Furido) collected the chakra and implanted them into his son's cell (genetically i guess). i know this from naru.wikia.com search for sora/kazuma/Nine-Tailed Demon Fox's chakra
Stronger Chakra = Stronger Technique
yes............she actually has some chakra of the nine tails.......hence she nowwhere near as strong as naruto
The 4th Hokage, Minato Namikaze, Naruto's father told Naruto that when he fought the nine tailed fox he felt that someone is controlling it and when he felt Tobi's chakra while in Naruto's. He told Naruto that it's the same chakra he felt while fighting with the nine tailed beast.
Naruto has the nine tailed fox demon sealed inside of him. In later episodes, they usually refer to it as a chakra monster.
Stronger Chakra = Stronger technique.
It was sealed inside minato and naruto. Naruto having the yang chakra which is the nine tails chakra and minato his yin chakra which is his spiritual energy.
Naruto and fukasku can't merge because the Kyuubi's chakra rejects fukasaku's. Naruto and Fukasaku don't merge cause of the nine tailed fox's chakra.
no one but naruto
The nine tail fox chakra is very immense but it does not have an infinite supply.
After 3 tails naruto looses his control and the nine-tailed fox's chakra takes over him
No he does not use the nine tailed fox