Only if they haven't already been removed in one of the previous checks; for example, checks for type go before checks for move, so if one were to do "/dexsearch dragon type, blast burn, mega", Charizard-Mega-X would be excluded as its base species (despite being the only correct result) would never be checked as it had already been removed by the Dragon-type check. That's only a single example, but it has the potential to occur for almost every mega evolution