My BH team(explanations and replays)

I started playing BH few months ago and I have been enjoying it as of late. After plenty of testing and battling, I came up with this team and got to 1500 with it on an alt named IK hit the X. After posting this team few weeks ago, I decided to do a little analysis on it.
My first pokemon:
Diancie-Mega @ Safety Goggles
Ability: Pixilate
EVs: 252 Atk
Hasty Nature
- Fake Out
- Extreme Speed
- Boomburst
- Diamond Storm

I decided to start my team off with a really strong pokemon. I learnt while battling how a fairy type that has priority coverage is extremely strong in BH. This pokemon can kill a lot of strong pokemon in the meta using only fake Out and extreme Speed. I use Boomburst for power and decided to go with Diamond Storm for some stab and coverage for fire types that can resist my hits. For the item, I decided to go with Safety Goggles, so that I can take spore from fast mons such as Deoxys Speed, as well as for other pokemons.

Shedinja @ Lum Berry
Ability: Sturdy
EVs: 252 Atk / 4 Def / 252 SpA
Brave Nature
IVs: 0 Spe
- Recycle
- Endeavor
- U-turn
- Whirlpool

Shedninja was my second pokemon. I chosed Shedninja because it paired really well with Diantie. During my battles, I saw that my diantie was getting outsped and was getting killed. This pokemon can deal with those that aren't mold breaker, since most fast hitters such as Deoxys-Attack and Mega-Rayquaza dont run status move. They do tend to run spiky shield, so you always have to be careful. Whirlpool is too trap pokemons as well as to 1v1 other shedninjas. Lum berry is too heal status. Finally, I have endeavor to weaken pokemons and U-turn to keep momentum. Obviously, u can use Prting Shot or Volt Switch if you are scared of a rocky helmet user coming in.

Yveltal @ Leftovers
Ability: Magic Bounce
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
IVs: 0 Atk
- Oblivion Wing
- Taunt
- Dark Pulse
- Rapid Spin

My next pokemon is Yvetal. Now what this pokemon is my hazard removal(shedninja dies to rocks and spikes), as well as too bounce back any status or hazard from a non mold breaker pokemon. Finally, I run Taunt to stop people from setting up or to keep using non attacking moves.

Aegislash @ Rocky Helmet
Ability: Prankster
EVs: 252 HP / 252 Def / 4 SpD
Relaxed Nature
IVs: 0 Atk
- Destiny Bond
- Parting Shot
- Stealth Rock
- Recover

Like I said earlier on, Fairy types with priority pixilate boosted is really good in the meta. Aegislash can stop Diantie pretty well, and it can give me momentum easily by clicking Parting Shot. I needed a rocker so I put rocks on this, and destiny bond is too kill both my pokemon and my opponent's pokemon. If i can kill a big threat to my team, it will be a good trade. Recover is for healing, and Prankster is that i always move first, since i have no attacking moves.

Mewtwo-Mega-X @ Lum Berry
Ability: Mold Breaker
EVs: 252 Atk
Jolly Nature
- Drain Punch
- Pursuit
- Ice Punch
- Precipice Blades

I needed 2 more pokemons on my team, and decided to go for some fast pokemons. I have mold breaker MewtwoX to be able to pursuit shedninja, and just being a good pokemon to whittle down my opponent's team. The moveset is for coverage purposes.

Arceus @ Expert Belt
Ability: No Guard
EVs: 4 Atk / 252 SpA / 252 Spe
Naive Nature
- Zap Cannon
- Dynamic Punch
- Inferno
- Blizzard

My last pokemon is No Guard Arceus. Not that many people will expect this, and it is a really good way to spread status over your opponent's team, as well as whitteling down ur opponent with this coverage.

Main threats in the tier:
Mega Gengar: Yvetal and Mega MewtwoX can check it.
Mega Rayquaza: Diantie can kill it easily. You also have Shedninja and Aegislash to deal with it.
Kyurem-Black: Diantie can kill it too.
Deoxys: You can play around it, by going to yvetal if hazard without mold breaker, shedninja if the contrary set and diantie can kill the mold brealer one using Fake Out and Extreme Speed.
Eviolite transform Chansey: Never let it transform into Arceus, or u might rage a bit since he's the one that is going to spread status. If he transform into:
-Diantie: go to Aegislash.
-Aegislash: go to Yvetal.
-Yvetal: go to Diantie.
-MewtwoX: Predict the move hes clicking and switch to the right pokemon.
-Shedninja: Aegislash can deal with it.

Replays:
Diantie is just broken http://replay.pokemonshowdown.com/?_ga=1.268329673.612480800.1478209812
Diantie+Shedninja is really good in the meta http://replay.pokemonshowdown.com/balancedhackmons-466945422
This team vs a random ladder team http://replay.pokemonshowdown.com/balancedhackmons-474579790

Thx for taking time and see my hole team and pls let me know any suggestions or advice. I am on pokemonshowdown pretty often on the name of poloki ou.