NFE All-Out Attacker (Magmar) @ Choice Specs / Life Orb  
Ability: Vital Spirit  
EVs: 252 SpA / 4 SpD / 252 Spe  
Timid Nature  
IVs: 0 Atk  
- Fire Blast  
- Psychic  
- Focus Blast  
- Hidden Power [Grass]
Optional Move(s): 
- Belly Drum
- Fire Punch
- Mach Punch
- Substitute
- Thunder Punch
Optional Item(s): 
- Aquav Berry
- Choice Scarf
- Firium Z
- Normalium Z
- Psychium Z
Optional Ability: 
- N/A
Optional EV/IV(s):  
- 252 SpA / 4 SpD / 252 Spe (Modest)
- 4 HP / 252 Atk / 252 Spe (Adamant)
Overview: With good coverage options and a good Speed and Special Attack stat, both Choice Specs and Life Orb Magmar act as good wallbreakers in the current metagame. It faces competition as a Fire-type wallbreaker from Monferno and Combusken, which slightly limits its viability.
All-Out Attacker: Choice Specs / Life Orb Fire Blast hits Grass- and Steel-types such as Roselia, Servine, Gloom, Ferroseed and Metang for super effective damage, while hitting most neutral targets reasonably hard. Psychic hits Fighting-types such as Machoke and Hakamo-o harder than Fire Blast but it also hits Mareanie hard. Focus Blast is a good coverage move for Normal-types such as Munchlax. Hidden Power Grass is primarily for Marshtomp but also hits other bulky Water-types such as Prinplup and Wartortle for super effective damage. 
Checks & Counters: Sliggoo walls Magmar; it easily tanks any hit and threatens Magmar out. Bulky Water-types such as Prinplup and Wartortle can typically withstand a hit or two from Magmar and force it out. Choice Specs Magmar is reliant on good prediction to effectively break against teams with a sturdy Fire resist and Life Orb Magmar is very susceptible to chip from Life Orb recoil and hazards. For example, specially defensive Mareanie does not appreciate switching into Psychic but can effectively pivot around Choice Specs Magmar unless it is played perfectly. Magmar has good speed for a frail wallbreaker, but faster offensive threats such as Electabuzz, Frogadier, Haunter and Kadabra can typically revenge kill it at full or after minimal chip.
Optional EV/IV(s): An alternative spread of 4 HP / 252 Atk / 252 Spe with an Adamant nature is viable for the Belly Drum, Fire Punch, Thunder Punch and Mach Punch Magmar set. This set can act as both an early-game wallbreaker or late-game win condition which takes advantage of any switches forced by the special Magmar set.