Can't lose the Nidra

[whiteninja]

well the only reason i can think of is that the Ribhava you wanted is nrmal mag but you raised it into a legendary mag and now that its a legendary mag it won't evolve ever again (unless you used a mag cell)

Once you get a special mag, it won't evolve even if you try to use a mag cell on it, and once you get a mag cell mag, it won't ever evolve again either.

Cyan, you're stuck with the Nidra, so you have 3 things you can do:
1) Say you messed up and turned into a Nidra and hope she likes it.
2) Say you purposely turned it into a Nidra as a surprise!
3) Get a level 5 mag of the same color and raise it to a Bhirava with the same stats and PB's and this time don't mess up, and then give it to her, and say that nothing went wrong.

I'd suggest the first one, lying/covering-up isn't good.