Something I recently came up with and have been using with a great success rate:
Keldeo @ Wide Lens
Ability: Justified
EVs: 4 HP / 252 SpAtk / 252 Spe
Timid nature
- Hydro Pump
- Focus Blast
- Protect
- Icy Wind / Quick Guard
This set's main draw is its power. Hydro Pump / Focus Blast are both significantly more powerful than their more reliable, LO counterparts (Scald, Secret Sword, respectively) an Wide Lens helps close the gap in terms of accuracy, making Hydro Pump have 88% accuracy and Focus Blast a still shaky yet more reliable 77% accuracy. Hydro Pump basically gains the accuracy of Draco Meteor, while Focus Blast becomes more accurate than Sleep Powder. The most important benefit in making this change is helping make Keldeo's chance to
OHKO 252/4 Mega Kangaskhan more than x2 times as likely (factoring in the miss chance.)
Damage calcs:
252 SpA Keldeo Focus Blast vs. 252 HP / 4 SpD Mega Kangaskhan: 390-458 (94.2 - 110.6%) -- 62.5% chance to OHKO ---
48.125% chance factoring in accuracy
252 SpA Life Orb Keldeo Secret Sword vs. 252 HP / 0 Def Mega Kangaskhan: 361-429 (87.1 - 103.6%) -- 18.8% chance to OHKO
More:
252 SpA Keldeo Focus Blast vs. 252 HP / 0 SpD Heatran: 372-440 (96.3 - 113.9%) -- 81.3% chance to OHKO --
62.601% chance factoring in the accuracy
252 SpA Life Orb Keldeo Secret Sword vs. 252 HP / 0 Def Heatran: 343-406 (88.8 - 105.1%) -- 25% chance to OHKO
ANOTHER crucial thing is the lack of Life Orb recoil! LO Keldeo will always die to 252+ Return + 1 round of LO recoil, while Wide Lens Keldeo does not have to worry about that problem yet
still hits harder.
Unfortunately you miss out on Scald's burn chance but that's not too terrible if you're just going to KO everything anyway :)