Thunder Wave Clefable
Clefable @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
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Thunder Wave
- Stealth Rock
- Soft-Boiled
- Moonblast
With physically defensive Clefable being particularly vulnerable to powerful Special Attackers like Mega Charizard Y as well as not having access to many standard moves that hurt it all that much at +0, Clefable invites this Pokemon in most of the time, with the only thing that Charizard has to worry about is a Special Attack drop from Moonblast. Thunder Wave, however, threatens Mega Charizard Y immensely. Clefable can also provide Stealth Rock support to further cripple Mega Charizard Y as it comes in.
Clefable isn't necessarily the Pokemon that takes out Mega Charizard Y, but it'll be the cause of its demise when Clefable's teammates that either speed-tie or are slower than it can take advantage of its now halved Speed.
* Mega Medicham and Mega Charizard X no longer have to risk speed ties and can OHKO it with Thunder Punch (or Zen Headbutt after a small amount of chip) and 2HKO with Dragon Claw, respectively.
* Kyurem-B can OHKO it with Fusion Bolt without having to worry about Focus Blast.
* Non-Scarf Tapu Lele can set up a Calm Mind in its face to reduce the damage taken from Flamethrower and then OHKO back with Psyshock.
* Stone Edge Tapu Bulu doesn't have to make a prediction against an incoming Mega Charizard Y anymore and can just use whatever it wants on the turn it switches in.
* Choice Band Zygarde either 2HKOes with Thousand Arrows or OHKOes with Outrage without taking unnecessary damage from Solar Beam. Z-Outrage sets can also get the job done, even without boosts.
* Z move Landorus-T can OHKO Mega Charizard Y with either Supersonic Skystrike or Continental Crush without needing to eat a Flamethrower beforehand.
* Any Tyranitar set OHKOes with Stone Edge before it can get hit by Focus Blast, not just the rare Choice Scarf set anymore.