Moltres

Moltres is one of the best counters to Swords Dance Scizor and Volcarona and can also spread burn, making it appealing for sand teams. It can also set up Substitute easily on Pokemon like Ferrothorn and specially defensive Heatran to more easily spread burn and PP stall foes. While its longevity isn't fantastic due to its vulnerability to Stealth Rock and sand, its immunity to Spikes and reliable recovery in Roost means that it can stay around long enough to remain useful throughout the game. Unfortunately, Moltres necessitates Rapid Spin support and is dead weight against rain. Its mediocre Speed means that it gets forced out by faster Pokemon that hit it hard, like Latios, Starmie, and Keldeo. Reuniclus is a particularly egregious Pokemon to deal with, since it doesn't care about burn and uses Moltres as setup fodder for Calm Mind. Finally, Moltres faces competition as a Will-O-Wisp user with Jellicent, Rotom-W, and Mew, all of which have better defensive typings and are less reliant on Rapid Spin support.