That's also assuming the same for Heatran as some of it's best partners, Ferrothorn, Landorus-T, Gliscor, Skarmory, have Stealth Rocks and are very popular checks towards Bird Spam. A few of them get a special mention as Landorus-T and Ferrothorn can make short work out of Lati-Twins and Excadrill; Some of Bird Spam's best hazard control partners.What you said it's true, but when you are playing against Char-Y, Talonflame and the more uncommon Volcarona, you are assuming that they will have Defog / Rapid Spin support and so Stealth Rock will be mostly likely out of the game and that's why Stone Edge and Arcient Power are cool moves to have in order to hit these mons.