Rate My Team- Sun/Moon OU

Question

This is a team I built, centred around Mega Pinsir. I'd appreciate any feedback anyone has.

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Team-Building Process

I haven't used Mega Pinsir pretty much ever, so I decided to build a team with it as my Mega.

I added Landorus to counter Pinsir's electric weakness, and because I've used it before on my teams, and it wrecks house.

The next Pokemon was Heatran, who I added as a wall, alongside Blissey. Both are in there to Toxic stall, and be impossible to kill.

I wanted a Dragon, so in went Banded Zygarde.

And finally, I needed a Z-Move and Defog user, so in went Mew, which is also used to Special Sweep.

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The Team

Blueberry (Pinsir-Mega) @ Pinsirite
Ability: Aerilate
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- Swords Dance
- Return
- Close Combat
- Earthquake
I called this one Blueberry because I like the shiny, and I think it looks like a blueberry when it Mega Evolves.

Myu (Mew) @ Mewnium Z
Ability: Synchronize
Shiny: Yes
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Psychic
- Ice Beam
- Knock Off
- Defog
The nickname just sounds adorable, in my opinion.

Yoghurt (Landorus-Therian) (M) @ Choice Scarf Ability: Intimidate
EVs: 252 Atk / 4 SpD / 252 Spe
Jolly Nature
- U-turn
- Earthquake
- Stone Edge
- Knock Off
Calling a Landorus Yoghurt is an old meme from another website.

Krakatoa (Heatran) @ Leftovers
Ability: Flash Fire
EVs: 252 HP / 216 SpD / 40 Spe
Calm Nature
IVs: 0 Atk
- Lava Plume
- Toxic
- Protect
- Taunt
Krakatoa is a volcano, and Heatran lives in a volcano.

Snekzzzzz (Zygarde) @ Choice Band
Ability: Aura Break
EVs: 4 HP / 252 Atk / 252 Spe
Adamant Nature
- Thousand Arrows
- Extreme Speed
- Outrage
- Superpower
SNEKY SNEKY SNEKKKKKKK

Muffin (Blissey) (F) @ Leftovers
Ability: Natural Cure
EVs: 252 HP / 4 Atk / 252 Def
Impish Nature
- Soft-Boiled
- Drain Punch
- Toxic
- Stealth Rock
It looks like a muffin. Nuff said.

Comments

The team looks good to me, except Blissey. In almost all cases, a Chansey holding an eviolite is a much better wall than a Blissey holding leftovers. If both are given the spread 4 HP/252 Def/252 SpD bold, then Chansey's defensive stats are 642/177/462, and Blissey's defensive stats are 652/130/307. As you can see, Chansey has much higher defenses and only a little bit less HP. Second, the EV spread could be a lot better. In most cases, when a Pokemon is hit by an attack, the damage is divided by the defense and subtracted from its HP. In most cases, a wall will also be taking about the same amount of physical as special damage, so the strength of a wall can roughly be measured by HP times the average of the defenses, or (physical defense + special defense) * HP / 2. If you use the EV spread you have now for eviolite Chansey, the number comes out to be 192192. If you use 4 HP/252 Def/252 SpD bold (or relaxed or impish), then the number comes out to be 205119. Therefore, it's better to invest in special defense than HP. Third, its attack stats are so low that indirect attacks (attacks that use the damage formula) will do almost nothing. Replace drain punch with seismic toss and give it a physical attack lowering nature to take less damage from foul play.

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Thanks for the advice. I've replaced Blissey with this:

Muffin (Chansey) (F) @ Eviolite  
Ability: Natural Cure  
EVs: 4 HP / 252 Def / 252 SpD  
Bold Nature  
IVs: 0 Atk  
- Soft-Boiled  
- Seismic Toss  
- Toxic  
- Stealth Rock

Is this better?

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That looks good to me, especially since I laddered past 1500 ELO using that exact Chansey set.