He's been taught by his parents how to fuse pokemon and that's what he does.
His family moved to Alola when he was young, and he felt a unique draw to mimikyu.
He is extremely socially awkward and avoids human interaction.
His parents left "on vacation" months ago, only giving him Maggi.
He wants to have a shiny mimikyu, just to have, not to fuse, but he has bad luck on that front, but good luck finding other shinies.
He was born without part of his right pinky.