I actually tried to answer you in the Trickmaster talk page, I'm not that good at summoning Omega Trickmasters, when I do summon one I use mission 222, doing Missions 57-57-10-222 and only defeating the usual enemies on mission 57, no Prize Egg or Great Pretender. Also I'm not 100% sure but I do believe they only drop Merryweather 5* at level 5 so you'll have to summon quite a few of them you have the chance to get the Merryweathers--Xabryn (talk) 21:25, 9 July 2016 (PDT)