pokemon tf story dreaming pikachu

a young boy has been having dreams of a group of pikachu that he had been part of in the dreams and it is intreging. he always wanted to be a trainer but got a suprise wish on his disabled sisters 10th birthday waking up as a pikachu without much of his human memories his mum revealed that the dreams were setting him up for a life as a pikachu for his sister but when sleeping will be with the other pikachu.