User blog comment:Kogath/Monster Hunter Online Discussion/@comment-28847569-20190319124417/@comment-26532315-20190319125343

That is most probably the April Fool's Monster for this year. I don't know what they had last year, but 2017 had a Congalala that would turn into a Gold Congalala with Rajang attacks, 2016 or 15 had a Yian Kut-Ku that would turn into a Tigrex.