People these things aren't decided a month before the game starts to be mass developed, this is something that is decided early on. You have to keep in mind it's not just "a line of text", the pokemon names encompass everything from Trading cards, promotional toys and most importantly the anime dub itself, which the dubbing company is most definitely working on already.
These all take a lot of time to produce, and aren't subject to some whim of the people to change, if the game is coming out in less than 2 months than you bet there is a lot of merchandise already in the works.
I doubt a multimillion dollar company like NoA is going to release names to "testdrive" them with the fans, and then change them due to public demand, it just doesn't happen.
if I had to guess these names - if they are indeed the official list - have been done several months prior to the announce of the first batch.
These wouldn't be just minor changes, it affects the whole franchise in general.