Gastly

Gastly is a fantastic Pokemon in the LC metagame thanks to its very good Speed stat, which allows it to offensively check tier titans such as fast Mienfoo and Snivy, and its top-tier Special Attack stat, which allows it to put enormous pressure on teams and reliably break down opposing walls. Its movepool leaves it with a plethora of coverage options that make it extremely difficult to switch into, and even includes reliable support moves such as Will-O-Wisp and Destiny Bond. Gastly's Ghost typing also comes with significant advantages, giving it an immunity to Fighting-type priority moves and allowing it to act as a risky spinblocker for hyper offensive teams. However, Gastly's poor defensive stats and weakness to the common Dark-type leave it prone to being taken out by anything it doesn't KO.