Is flash cannon the right move here? It's incapable of breakign through the more specially defensive fairies, such as a max HP togekiss, and specially defensive sylveon/florges, yet the more physically defensive, or mixed defensive ones such as azumarill and mawile are only hit neutrally with steel attacks. IRon tail may have atrocious accuracy, but i'd rather have a 75% chance of breaking through a defensive togekiss and sylveon than a zero percent chance. It is worth mentioning that flash cannon will OHKO togekiss after stealth rocks, though, unless it is fully specially defensive. Gengar has a decent chance to live the flash cannon, and mega gengar will 100% of the time from full strength, but iron tail flattens both of them. Cant think of any relevant fighting resists that flash cannon hit better than iron tail mostly, both moves such agaisnt gyarados, starmie, tentacruel, mega charizard, talonflame and neitehr are getting past mega venusaur. Espeon an survive a flash cannon and close combat, but gets demolished by iron tail.