This questions is answered, but I'm still open to new ideas so if you have any, please drop 'em off in the comments or an answer.
Registeel @ Life Orb
Ability: Clear Body
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Stealth Rock
- Thunder Wave
- Iron Head
- Earthquake
Sets up Stealth Rocks which helps the other Pokémon land KOs, break sashes, Sturdy, etc. Also limits some switches. Thunder Wave support is generally nice, and Registeel can get a nice Paraflinch going on with STAB Iron Head. Earthquake is the other attack and does have pretty nice coverage.
Escavalier (M) @ Choice Band
Ability: Swarm
EVs: 252 HP / 252 Atk / 4 SpD
Adamant Nature
- Megahorn
- Iron Head
- Double-Edge
- Pursuit
Hits extremely hard with max Attack, Adamant, Choice Band. Megahorn does a lot of damage to whatever it hits, and it sometimes gets the Swarm boost, which is nice. STAB Iron Head is the other attack, making dual STAB. Double Edge hits Pokémon that the STABs aren't very effective against, but Iron Head and Megahorn are the main attacks. Pursuit is a handy little attack, making sure to get threats eliminated.
Mismagius (F) @ Life Orb
Ability: Levitate
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Nasty Plot
- Shadow Ball
- Thunderbolt
- Taunt
Nasty Plot boosts Special Attack to a very nice level. Shadow Ball is STAB, and Thunderbolt hits Water-types and Flying-types. Taunt is a very nice addition, as it helps out a lot. The team is actually based around Mismagius, pretty much. She, along with Chandelure, takes Fighting-type attacks for Porygon-Z and Registeel.
Chandelure (F) @ Life Orb
Ability: Flash Fire
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Substitute
- Fire Blast
- Shadow Ball
- Pain Split
Flash Fire grants immunity to Fire-type attacks, which especially helps Registeel and Escavalier, as well as the team in general. Chandelure sets up the Substitute and hits hard with Life Orb-boosted Fire Blast and Shadow Ball. The Substitute damage, along with Life Orb and the opponent’s attacks, racks up, so Pain Split helps recover HP. Works well with Chandelure's decent defenses and mediocre HP.
Zapdos @ Life Orb
Ability: Pressure
EVs: 4 HP / 252 SpA / 252 Spe
Timid Nature
- Thunderbolt
- Heat Wave
- Hidden Power [Ice]
- Roost
Takes Ground-type attacks for Chandelure and Registeel. Also has STAB Thunderbolt to hit Water-types, which the team sometimes struggles against. Heat Wave allows Zapdos to deal with Steel-types and Grass-types, helping out Thunderbolt. Hidden Power [Ice] is for Landorus, Gliscor, and Dragons. Roost heals Zapdos from Life Orb damage and opponent's attacks.
Porygon-Z @ Choice Scarf
Ability: Adaptability
EVs: 4 HP / 252 SpA / 252 Spe
Modest Nature
- Tri Attack
- Dark Pulse
- Hidden Power [Fighting]
- Trick
Tri Attack is the main attack Porygon-Z will be using. STAB, boosted by Adaptability, doubles the damage, which is the same as super effective. Dark Pulse is there to hit Ghost-types, which are immune to Tri Attack, and it also has a nifty flinch chance. Hidden Power [Fighting] is there to hit Steel-types, who resist both the above attacks. Trick can really mess with an opponent's setup.
I'm hoping I can get more out of this post than my opponents looking at this team while battling me to have the advantage.
If you see an improvement that could be made, or a possible change, please post so in a comment or answer.