One way to develop Ash's aura powers in fanfiction is to have him experiment with different applications of his powers. Instead of just using it for battles, he could try to use it for things like teleportation. Maybe he discovers that by focusing his aura in a certain way, he can transport himself and his Pokémon short distances. He could also learn from other characters who have different types of aura - based abilities, and combine their techniques with his own.
In fanfiction, Ash's aura powers could be developed by exploring his emotional state. If he experiences strong emotions like love or determination, his aura powers might grow. For instance, if he has a strong desire to protect a friend or a Pokémon, his aura could flare up and gain new abilities. Also, he could go on a spiritual journey to an ancient place related to aura, where he learns from the environment and the Pokémon there.
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