At first I thought that this story was focusing on the creation, but then came the boy and the three legendary. On first look, Mewtwo came to my mind. It would be really interesting to see what role the boy would play in the future, and what the power will bring to him; a gift or a curse.
There wasn't any spelling or grammatical error that really capture my attention. This is pretty good for beginning. I hope you can continue writing this! :smilie: