Error is reborn in the Pokémon universe as a human. He has to use aura instead of magic because that's how the power of the soul works in this world. He can still wield his aura into strings and construct bones. It's more difficult to wield his power now because a human body doesn't have that direct link that his previous magical body had to his soul nor is does it have the stamina to consistently harness the energy without years of training.
Would he even be interested in technically catching and enslaving Pokémon to use them to fulfill a purpose? It's what it looks like to him as kids were allowed to command small animals to fight each other for glory. He hasn't really seen older trainers who have had years to bond with their Pokémon and life long companion. Only little brats who see Pokémon as a means to an end.
Depending on the type of Error he would more likely be interested in raising and healing abused Pokémon.(Fgod) Mastering his aura to heal.
Maybe he's the exact opposite and takes this as an opportunity to enjoy a good fight. Might even enjoy training Pokémon to beat up other peoples.
Or maybe he is just to tired of all this and tries to get a less troublesome job, but keeps finding himself in troublesome situations anyway.
In any of these cases he'll probably end up with a lucario at some point. Best suited to his personality.
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Story Ideas Of Error Sans And Others
FanfictionThis book contains different story line ideas that are free to use. A god of destruction error, a forced god of destruction error, a soulless error, crossover ideas, and original character inserts. Undertale Created by Toby Fox Error sans Fresh san...