User blog comment:- MHCaboose -/Monster Hunter Frontier Z Discussion/@comment-26995086-20170510204511/@comment-7784930-20170510210728

"Hunting Bans" are a term Capcom like to use when monsters come in and out of the series, for example when Nargacuga never made it into MH4/MH4U there was a small statement with the term, when it came to it being announced for MHX they used that term again. Frontier almost always uses this term when releasing new monsters.

There was no official statements of an actual ban between the two games.