Good team. However, I've spotted a big flaw. You're weak to fast Electric-type Pokémon.
Fixes I suggest:
1. Keldeo: Hidden Power Ghost > Icy Wind
252 SpA Choice Specs Keldeo Hidden Power Ghost vs. 252 HP / 24 SpD Slowbro: 228-270 (57.8 - 68.5%) -- guaranteed 2HKO after Leftovers recovery
252 SpA Choice Specs Keldeo Hidden Power Ghost vs. 0 HP / 0 SpD Latios: 180-214 (60.2 - 71.5%) -- guaranteed 2HKO
Use of smart predictions and Hidden Power Ghost will net you, in one single moveslot, a nice lure to common answers to Keldeo such as Slowbro and Latios. While Latios will be faster, it's still taking a lot of damage. With Hidden Power Ghost, you're getting at least neutral damage on every single Pokémon in the game.
2. Latios: Hidden Power Fire > Psyshock
In this team, you have good answers to Venusaur-mega, Chansey and Amoonguss. Hidden Power Fire acts as a lure to Ferrothorn and Scizor, and it is noteworthy that Dragon/Fire has great neutral coverage. However, Azumarill could become problematic, in which case Thunderbolt becomes an interesting, albeit specialist option.
3. Clefable: Stealth Rock > Heal Bell
4. Landorus-Therian: Scarf set
These two changes will allow you to keep Stealth Rock in the team, while making use of Landorus as a scarfed revenge killer and answer to fast Electric-type Pokémon. You'll lose the defensive Ground-type you needed but Intimidate and the relatively good natural bulk Landorus sports may make up for this loss partially. You'll lose on Heal Bell's advantage of curing you from nasty statuses but you can count on Clefable to absorb Toxic, Will-O-Wisp and on Landorus to block Thunder Wave. You may need to fodder someone for Spore but you can counterplay around it.
>These changes will make your team slightly more offensive and less bulky, so you may want to reconsider what you wanted in the first place; for me, the weakness to the Manectric-mega + Bisharp core was too glaring to ignore, and so I believe with these fixes the team could perform better, but different.
Change Log
Scroll down to see the changes.
MyLittleNuke (Keldeo-Resolute) @ Choice Specs
Ability: Justified
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 1 Atk / 30 Def / 30 SpD
- Scald
- Secret Sword
- Hydro Pump
- Hidden Power Ghost
Flight 204 (Latios) @ Life Orb
Ability: Levitate
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk
- Draco Meteor
- Psyshock
- Recover
- Defog
Boo (Landorus-Therian) @ Choice Scarf
Ability: Intimidate
EVs: 252 Atk / 252 Spe / 4 Def
Jolly Nature
- Earthquake
- Knock Off
- Stone Edge
- U-turn
FearMeMortals (Clefable) @ Leftovers
Ability: Magic Guard
EVs: 252 HP / 172 Def / 84 SpD
Calm Nature
IVs: 0 Atk
- Moonblast
- Soft-Boiled
- Thunder Wave
- Stealth Rock