Houndoom

Though it is often forgotten, Mega Houndoom brings a huge amount of utility to the table, checking dangerous threats such as Bisharp and Latios. It also has favorable matchups against common Pokemon; against offensive teams, common switch-ins to it such as Tyranitar and Azumarill are crippled by Will-O-Wisp, while stall teams are troubled by Taunt. Mega Houndoom's access to Nasty Plot and its high Speed allows it to sweep teams with ease. However, its weakness to Stealth Rock can be troublesome: it also is forced out by threats such as Keldeo, Heatran, Rotom-W, Tornadus-T, Mega Lopunny and Mega Altaria. Nonetheless, Mega Houndoom's utility and ability to sweep balanced teams easily makes it a solid choice to build around.