Hey guys I'm mrnastyafrican and this is my first RMT on smogon. I been playing in NU for about a month or so and I been playing with this team for about a week. Im posting my team to have some insight on what i should improve on.
Pawniard@eviolite
Ability: Defiant
EVs: 40hp/252Atk/108Def/108SpDef
Adamant: (+Atk,-SpAtk)
(Sword Dance/Knock Off/Sucker Punch/Brick Break)

Pawniard@eviolite
Ability: Defiant
EVs: 40hp/252Atk/108Def/108SpDef
Adamant: (+Atk,-SpAtk)
(Sword Dance/Knock Off/Sucker Punch/Brick Break)
I chose to build my team around pawniard, it is one of my favorite mons in NU and it so happens to be one of the deadliest. I decided to go with a bulky SD set because it seems to be the most effective.. to me anyways. Knock off is a great move in general and plus it gets STAB same as sucker punch. Brick break is there to hit other pawniards and other steel types.

Weezing@BlackSludge
Ability: Levitate
EVs: (252hp/240Def/16SpDef)
Bold:(+Def,-Atk)
(Sludge Blomb/Rest/Sleep Talk/Stock Pile)

Rhydon@eviolite
Ability: Rock Head
EVs:(252hp/200Atk/56SpDef)
Adamant:(+Atk,-SpAtk)
(Stealth Rock/Rock Blast/Earthquake/Roar)

MantineLeftovers
Ability: Water Absorb
EVs:(252hp/252SpDef/4SpAtk)
Calm:(+SpDef,-Atk)
(Defog/Scald/Toxic/Protect)

PyroarChoice Specs
Ability: Unnerve
EVs:(252SpAtk/252Spe/4hp)
Modest:(+SpAtk,-Atk)
(Fire Blast/HP Grass/Dark Pluse/Hyper Voice)

MismagiusLifeOrb
Ability: Levitate
EVs:(252SpAtk/252Spe/4Spd)
Timid:(+Spe,-Atk)
(Nasty Plot/Taunt/Shadow Ball/Psychic)
Mismagius is good addition to the team because he is immune to fighting and ground type moves.With Taunt Mismagius can lead against stealth rockers like uxie and mesprit and force them to switch out unless they want to die from shadow ball.