Ok so in game its not showing this mythic but your fb page says otherwise
Huh, never did check the facebook page. Caught me off-guard.
Saw it by chance while I was scrolling through my newsfeed
Interesting. Might check it out as well 
It’s been removed now
This Special Egg was canceled due to the delay of the update we was planning to release today.
We ran a different Special Egg instead. If you have any questions, please check the in game news or Egg hatching page for more details.
We are sorry for causing confusion and will keep our Facebook information up-to-date as much as possible. Event schedules are less likely but may be changed due to several factors, please see in the game for the most up-to-date information.
Regarding the update, it should be able to go live next week.
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Correction: They featured lavaronix in the egg instead of the mythic.