Klefki

Fairy

Prankster Klefki is a great support Pokemon because of its access to priority Spikes, Thunder Wave, Reflect, and Light Screen, which allows teammates such as Azumarill to set up easier. Klefki's typing provides it with a large number of resistances, including Normal, Flying, and Fairy, along with an immunity to Poison-type moves, which allows it to check threats like Alolan Muk and Nihilego. Due to Klefki's great defensive typing and access to priority status moves, it can easily set Spikes or screens multiple times throughout the battle. It can also cripple fast setup sweepers such as Porygon-Z with Prankster Thunder Wave. However, its bulk is subpar without screens. While Klefki can paralyze setup sweepers, it should be noted that Klefki may become a liability, as many can continue to set up on Klefki regardless. Klefki is incredibly passive and, when lacking Foul Play, it can be used as setup fodder by certain Pokemon such as Garchomp and Landorus-T. Klefki relies heavily on its use of support moves and has a pitiful offensive presence, making it very vulnerable to Taunt. Klefki also lacks reliable recovery, causing it to be easily worn down by attacks and entry hazards.

Steel

Klefki is a useful Pokemon on offensive Steel teams due to its status as the best dual screens setter available to them. Hyper offensive Steel teams greatly appreciate its support, as they have a wide variety of setup sweepers, such as Mega Scizor, Jirachi, and Celesteela, to exploit it. Klefki's Prankster ability gives it a unique niche of priority status moves, which almost always ensures that Reflect or Light Screen will go up before the opponent hits Klefki. Access to Spikes and Thunder Wave allows Klefki to pressure the opposing side by supplying lasting chip damage or crippling offensive Pokemon. Unfortunately, Klefki is very passive and can easily be threatened out by Taunt and certain Defog users such as Tapu Koko and Gliscor. Even with Foul Play and Thunder Wave, certain setup sweepers like Diggersby and Landorus-T can proceed to set up on it without fear as well. Klefki's defensive presence is also hindered by its vulnerability to two of Steel's weaknesses, Fire and Ground, and lack of reliable recovery.