User blog comment:Xandermcc/Elseworlds Speculation/@comment-3127448-20181115225653/@comment-3127448-20181116042801

http://thathashtagshow.com/2018/10/02/lamonica-garrett-arrowverse-elseworlds/ Says Monitor will be in all 3 episodes.

http://thathashtagshow.com/2018/09/04/exclusive-arrowverse-crossover-major-kryptonian/ This is his cover name which says he may appear post crossover.