How to fodder Lewyn

It finally happened! I pulled a spare Lewyn with bad IV. But do I...

- merge into my +spd/-def Lewyn?
- fodder Special Spiral onto Ophelia?
- fodder Odd Atk Wave onto... Someone?
- hold onto him indefinitely, considering for hours each week but never actually doing anything out of debilitating indecision?

Halp!