Well it depends on what your looking for in terms of "Main" Messengelato is their main floater, allowing them to search for any Madolche spell/trap when special summoned, Mewfiewlle, allows when normal summoned to special summon any Madolche in hand there is also Magiline which searches for anything else they need. However, some of the biggest monsters that cause issues are Puddingcess and Tiramasu. Puddingcess, a 1000 beater who gains 700 attack if there are no monsters in the grave, combined with another 500 boost when Chateau is on the field, which normally is almost always, gives it a 2200 beater status, however it has an annoying ability. Whenever it battles (attacking or attacked) it can destroy one card on your opponents side of the field. Even worse is Tiramasu, their key XYZ mosnter, which made simply with 2 lvl 4 monsters adds onto their Recylcing capability. By using one matierial, it can return up to 2 Madolche cards in grave back to deck, in order to target up to 2 cards you control and bounce them back to deck as well.
As for Madolche Plateau, I'll put it this way, don't expect to NOT see it in a decent Madolche build.