Glalie

Between its powerful Refrigerate-boosted STAB attacks and various coverage moves, Mega Glalie is a difficult Pokemon to switch into in the RU tier. It acts as an aggressive Spikes setter, as it forces many switches, that give it the opportunity to set Spikes layers up, and it threatens common entry hazard controllers such as Donphan and Mandibuzz by virtue of its strong STAB attacks. Mega Glalie also sports an above average base 100 Speed, allowing it to outpace and threaten a large number of threats in the metagame, including Roserade and Honchkrow, and threaten them with its STAB attacks. Glalie also has access to the valuable STAB Ice Shard, which allows it to pick off a number of threats in the tier, such as Dragon Dance Zygarde-10%, Noivern, and Chlorophyll Venusaur, which can be hard to revenge kill. However, a terrible defensive typing and only average bulk leave Mega Glalie unable to switch in on much and forced out by a number of faster offensive threats, and a weakness to Stealth Rock combined with a main STAB move that causes recoil makes it so that Glalie's time on the field is often short. Finally, Glalie's coverage moves leave a bit to be desired, as they often fail to net 2HKOs on their targets, causing Glalie to be forced out and potentially take more hazard damage.