Probably Natsu. Natsu has his own dragon - slayer magic which is already very strong. If he were to bond with a legendary Pokemon like Rayquaza, he could become almost unbeatable. Rayquaza's flying and powerful attack abilities, along with Natsu's fire - based attacks, would create a terrifying combination in battles.
Erza might be a top contender. She has great combat skills and can switch between different armors. If she had a Pikachu as her Pokemon partner, Pikachu's electric attacks could be used in combination with her sword - fighting skills. She could also use her strategic mind to plan battles and make the most of Pikachu's speed and agility.
One idea could be that the Fairy Tail guild members discover a portal to the Pokemon world. They then team up with different Pokemon trainers to stop an evil organization that's trying to take over both worlds. For example, Natsu could befriend a Charizard and use its fire power in combination with his own to fight enemies.
The magic in Fairy Tail could be combined with Pokemon elements by having spells that are related to Pokemon types. For instance, a water - mage could use a spell to create a Pokemon - like water creature. Or a lightning - mage could summon an electric - type Pokemon - inspired bolt of energy.
One great fanfiction could be about Natsu facing an ancient and extremely powerful dark wizard alone. In this story, Natsu's dragon slayer magic reaches new heights as he discovers a hidden power within himself. Maybe it's related to his connection with Igneel that he hasn't fully tapped into yet. He uses his fire magic in ways that are more creative and intense, like creating a massive firestorm that not only burns but also has the power to nullify the dark wizard's magic.
In a Fairy Tail fanfiction with Cloud Strife, he might have a hard time adjusting to the guild's rowdy and friendly atmosphere at first. But as time goes on, he starts to open up and even shows off his cool sword moves during the guild's festivals. He could also learn some new magical techniques from the Fairy Tail mages, adding a new dimension to his fighting abilities.
One of the most powerful could be a fan - created character who has the ability to summon multiple Celestial Spirits at once. This would give them a huge advantage in battle as they could combine the powers of different spirits.
First, decide on the main characters. You can choose some popular Pokemon and Fairy Tail characters. Then, create a plot. Maybe it could be about a tournament where Pokemon battles and Fairy Tail magic are combined. Also, think about how the two different worlds' rules will interact.
One common theme is friendship. Just like in the original Pokemon and Fairy Tail series, in fanfictions, characters from both universes form strong bonds. For example, Ash from Pokemon might become friends with Lucy from Fairy Tail and they help each other out.
It could be Makarov. His experience and extremely powerful magic could give him an edge. He has seen many battles and his Fairy Law is a very strong spell. In a situation like an Infinity War, his leadership and power would be crucial for the Fairy Tail guild.
It's really hard to say. On one hand, you have characters like Gildarts in Fairy Tail who can destroy mountains with his magic. But then in Naruto, there are characters like Kaguya who has god - like powers. If we consider the ability to adapt, Naruto himself could be very powerful in a Fairy Tail - Naruto crossover. His ability to quickly learn new techniques and his never - give - up attitude would make him a formidable force. He could potentially learn some basic magic in no time and combine it with his ninja skills.
It's really hard to say. Goku in his Super Saiyan Blue form has incredible power levels and combat abilities. But then again, Acnologia from Fairy Tail is an extremely powerful dragon. If he were to face Goku, his dragon - like abilities and powerful magic attacks could pose a real threat. However, Goku has the ability to keep getting stronger during a fight, so it could go either way.