I leveled my nincada all the way up to 99, opened up 2 slots in my party with plenty of pokeballs in my inventory, fed it a rare candy and allowed it to evolve. I wound up with a shedninja and no ninjask. This is unacceptable since my goal was to obtain a ninjask and the shedninja was just a bonus. I can provide screenshots with the relevant time-stamped information upon request. If possible please remedy this error and return the bugged bug to me, if you can forgive the pun that is.

This is how nincada's evolution works in the game:

- if leveled up with an open spot in your team, it will evolve into shedinja

- if leveled up with no open spot in your team, it will evolve into ninjask

 

you evolved it when you had an open spot in your team and got a shedinja, now that it's done there's no way for you to get ninjask out of evolve a new nincada.