I understand your frustration. Here's the corrected version:
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"Vulpix, do you like this little brother?"
Fuji rubbed the little head of the Vulpix and asked with a smile.
"Uh-huh," Vulpix responded, raising its head slightly, its brown eyes full of curiosity.
"Hello Vulpix, I'm Naruto."
Naruto leaned in front of Vulpix with a fawning smile on his face. The moment he saw Vulpix, Naruto's heart was captured.
"Hmm, ahhhhhh," Vulpix waved its front paws as if to welcome Naruto.
"Wow, that's cute."
Naruto looked at Vulpix longingly.
"Would you like to hug Vulpix?"
Fuji noticed Naruto's longing look and asked with a smile.
"May I?"
Naruto asked timidly, as if he was afraid of being rejected by Vulpix.
"Of course you can, Vulpix's personality is very docile."
Fuji chuckled. "Right, Vulpix?"
"Woooo," Vulpix nodded in agreement.
When Naruto heard this, he squatted down slightly and slowly approached Vulpix. Vulpix tilted its head to look at Naruto, feeling Naruto's kindness, and did not back away.
Naruto's hand trembled a little but finally touched Vulpix's little head.
"Uh-huh."
Vulpix showed a comfortable expression and took the initiative to rub Naruto's hand.
"Woooo," Naruto felt the closeness of the Vulpix and became excited. His action of stroking Vulpix grew more and more gentle.
Although Vulpix wasn't human, Naruto found a sense of identity in Vulpix's presence.
This made Naruto smile and pick up Vulpix, rubbing the little Pokémon's head with his cheek.
"Vulpix, you are so cute, you actually have six tails."
"Woooo," Vulpix responded, clearly enjoying the attention.
"The reason why Vulpix is called Vulpix can't be because it has six tails, right?"
Naruto let go of Vulpix a little and asked curiously.
"Yes, Vulpix is called that because it has six tails."
Fuji explained with a smile. "When Vulpix is born, it has only one tail. As it grows, the tail splits and changes color, increasing to six tails."
"So that's the case. Will the number of tails of Vulpix increase?"
Naruto wondered aloud. "When the time comes, won't the seventh tail be called Seven Tails? Eight Tails called Eight Tails? Nine Tails called Nine Tails?"
"Huh?"
The Nine-Tails, still chuckling about Vulpix, looked a bit displeased.
"Didn't this silly boy hear? Since it's called Vulpix, it'll have at most six tails."
The Nine-Tails roared internally. "What an idiot. I'm the only Nine-Tails, the Nine-Tails."
Though the Nine-Tails knew Naruto couldn't hear, it couldn't help but express its frustration.
"Can Vulpix grow more tails?"
Fuji continued. "Without external help, Vulpix will have at most six tails. However, with the help of a Fire Stone, Vulpix can evolve into Ninetales."
The Fire Stone, a rare item, is not naturally found in the ninja world. Fuji only offers it in his shop once Pokémon sales increase.
"Fire Stone? Evolve?"
Naruto scratched his head, not quite understanding.
"Ninetales? I am the Ninetales, and there's only one Ninetales in this world: me, the Nine-Tails."
The Nine-Tails growled internally, its amusement from earlier gone.
"Brother Fuji, I'll buy this Vulpix. How much is it?"
Naruto was resolute despite not fully understanding the concepts of evolution and the Fire Stone.
"Are you really sure?"
Fuji reminded. "You still have five more draws today."
"Of course I'm sure."
Naruto nodded firmly. "Just like Brother Fuji said, I believe drawing Vulpix is fate's arrangement for me! I will definitely take good care of Vulpix."
Seeing Naruto's serious expression, Fuji was convinced of Naruto's sincerity.
"Thank you for your patronage. The cost for Vulpix is 400,000 yen."
"What? 400,000?!"
Naruto's eyes widened in shock.