It censored it, but I myself looked through it to find out if it had a secret bad word, but wasn't able to find one. Can someone answer with the explanation why?
Note: This Greninja is mine it has been bred to have me as an OT.
Here's why:
It has "kak" in it, and in South African, it means "sh**or feces.
That's why you can't name it
Hope I helped!
Source: http://www.thefreedictionary.com/kak