Has no one done this yet? Wow, okay, here goes nothing...
Clefable @ Red Card/Leftovers
Trait: Magic Guard
Bold/Calm Nature (-Atk for both natures. +Def for bold, +SpDef for calm)
EVs: 252 HP, 152 Def, 104 Sp. Def (for bold nature) / 252 HP, 240 Def, 16 Sp. Def (for calm nature)
IVs: 0 Atk (Pro tip, use 0 attack ivs on Pokemon that lack physical moves! Reduces damage taken from hitting yourself in confusion/getting hit by the move Foul Play!)
- Cosmic Power
- Soft Boiled
- Charge Beam
- Stored Power
Oh boy, where do I even start? I suppose I should explain the natures and EVs. For this set, you want as much bulk as possible, so I chose max hp, since you can increase your def and sp. def with cosmic power. From there, pick Bold/Calm nature, the selected EVs balance out the def and sp. def equally at a max of 242, unboosted by cosmic power, that is. The def and sp. def EVs are very flexible, though, if you find the EVs don't work for you, you may change them to your preference. Now, It's time for the fun to really begin. As I've mentioned before, Cosmic Power will increase your Defense and Special Defense. Within a few turns, you'll be eating attacks like candy. Red Card forces a switch-out upon taking the first direct hit, which helps you set up if the opponent has a poison/steel move, or is also setting up to break through your defenses. From there, Soft Boiled provides recovery, which you can use whenever you feel you may need it, Leftovers is also an option if you feel soft boiled alone isn't enough, to replace Red Card. You can also replace Soft Boiled with Moonlight, if you're in a situation where soft boiled isn't an option, or a very hard to get option, at the cost of less PP. So let us imagine now you have all the defenses you need up and your hp is plentiful. From there, you can spam Charge beam. It has a 70% chance to raise your special attack, which just makes it and stored power even stronger. Speaking of Stored Power, this is the best part. After raising your def, sp. def and sp. atk quite a bit, Stored power should have around 200-400 power, depending on how high you chose to raise your stats, and provides poison type coverage. Slap this crazy high power next to a boosted sp. atk stat, and you'll slice through everything that's not dark type like a hot knife to butter, even those that resist it take heavy damage from it. Speaking of dark types, that's of course, where charge beam comes in to help. It may have low power, but it makes up for it with your sp. atk stat, which probably is just going to get even higher if you have to use it. It basically provides stored power support + Coverage support. And choosing charge beam and Stored Power over moves like say, toxic, just absolutely trolls taunt users. And speaking of toxic, Magic Guard kills off any hope your opponent might have of taking you down through status conditions, and much more. All in all, you're left with a near unstoppable Pokemon against unprepared teams, and this is only ONE Pokemon on your team, in which you could fill with anything, including checks to Clefable's counters. How's that for OP?