Wurmple’s Eevee hack?

My local park is now a Wurmple nest and I have been wondering about it's evolution mechanics. Just a 50/50 chance? Do either of the wurmalutions have any value outside the pokedex entry?

IIRC, in the main games Wurmple's evolution is random also, so unlike any complaints about not being able to control Eeevee's evolution, Wurmple being completely random is fitting. You can tell by the first evolution what it will become so it is not as much candy needed for eventually getting both pokedex entries.