There have been recent claims that all evidence is doctored. No evidence to support this extraordinary claim has been provided, including the unmolested chat logs that this is allegedly derivative of.
In addition to this information pertaining to the chat, another anonymous contributor has provided evidence of Glip’s intention to do a child/pokemon doujin (which is of no legal wrongdoing, simply a testament of particular behaviors online that coincide with the alleged offline behaviors). It is currently still accessible via Tumblr. Archive.is can only partially save the page.
Do note the the artwork in question is not by PK.