I want to evolve a Mantyke and I need a Remoraid. Though I also want an Octilary so I want to know if Remoraid will disappear.
In short: No. He will just 'assist' Mantyke in evolving. Your Remoraid will be fit to evolve another day. ¬(-_-)/
Here is the Mantyke Page:
And the Remoraid Page:
Good luck evolving :D
Source: Experience + The links above