He could encounter it during a time - travel arc. Naruto gets sent to a different universe where the Phoenix Force exists. He quickly realizes its potential and tries to figure out how to use it without being consumed by its power.
Well, one idea for this fanfiction could be Naruto somehow getting connected to the Phoenix Force. Maybe it's during a mission in a strange dimension where he discovers the power of the Phoenix Force. It could give him new abilities like enhanced healing, which is similar to his own natural fast - healing ability, but on a much larger scale. And this new power could also attract new enemies who are after the Phoenix Force.
The Black Phoenix was a character in Marvel Comics. It was one of the most powerful creatures in the Marvel Universe, with unlimited power and the ability to be reborn. It was a black phoenix that could control the flight and rebirth of other phoenixes. The Black Phoenix had also appeared in the Marvel Cinematic Universe in the movies Avengers 3: Infinite War and Avengers 4: Endgame.
He might need to train a lot. Just like he trained to control the Nine - Tails' chakra. He could start with small amounts of the Phoenix Force's power and gradually increase his control.
One great 'X Men Phoenix Force' fanfiction is 'Rise of the Phoenix'. It delves deep into the character of Jean Grey as she struggles with the power of the Phoenix Force. The story has amazing character development and intense action scenes.
Well, usually it involves a new hero emerging in the Marvel Strike Force universe. This hero might be facing some sort of threat to the world or the team. They then have to use their unique powers and skills to overcome challenges and prove their worth to the rest of the strike force.