Fairy Lock
Klefki @ Shed Shell
Ability: Prankster
EVs: 248 HP / 244 SpD / 16 Spe
Careful Nature
- Fairy Lock
- Spikes
- Thunder Wave
- Play Rough
I'm not sure if this is the most optimal set with this idea, feel free to send me a private message if you have some advices.
The main idea of this set is to craft a gameplan around the momentum. Fairy Lock allows Klefki to lock all Pokémons in the field for the next turn, and shed shell remove this drawback on your side. In other words, you can lock something for one turn and make sure that the opponent cannot double switch. Furthermore, if played well, you can trade your Klefki to trap kill something really annoying against your team, if Klefki dies after using Fairy Lock. The others moves are common on klefki, to maximize his efficiency overall.