Offensive core: Azumarill + Serperior
+ 
This is a cool core that I came up with while teambuilding.
These two Pokemon are great wallbreakers (Serp can wallbreak once it gets to +2) that remove each other's counters.
Serperior beats things such as Slowbro, Rotom-W and Ferrothorn, which Azumarill appreciates. Azumarill beats Pokemon that Serperior dislikes
such as Heatran and Altaria-Mega, as well as dealing heavy damage to Tornadus-T. These two Pokemon get walled by Venusaur-Mega and Will-o-Wisp Bulk-Up Talonflame, so partners such as Hidden Power [Flying] Thundurus, Swords Dance Talonflame, Tail Glow + Psychic Manaphy or Rock Rock Slide + Psychic Landorus-I are recommended.
Several moves can be run in the 4th moveslot on Serperior such as Giga Drain, Glare, Synthesis or Taunt. Giga Drain does pitiful damage at +0, but at +2 it can be used as semi-reliable recovery. Glare can be run to cripple fast offensive Pokemon such as Lati@s, Talonflame and Tornadus-T Synthesis provides reliable recovery, but gives checks free switch-ins. Taunt allows Serperior to act as a stallbreaker, locking opposing Pokemon out of recovery and status moves.


Serperior set
Serperior @ Life Orb
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Leaf Storm
- Dragon Pulse
- Hidden Power [Fire]
- Glare / Taunt / Giga drain / Synthetis
Azumarill set
Azumarill @ Choice Band
Ability: Huge Power
EVs: 84 HP / 252 Atk / 172 Spe
Adamant Nature
- Play Rough
- Waterfall
- Aqua Jet
- Knock Off / Superpower
Or
Azumarill @ Assault Vest
Ability: Huge Power
EVs: 240 HP / 252 Atk / 16 SpD
Adamant Nature
- Play Rough
- Waterfall
- Aqua Jet
- Knock Off
Serperior @ Life Orb
Ability: Contrary
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
IVs: 0 Atk / 30 SpA / 30 Spe
- Leaf Storm
- Dragon Pulse
- Hidden Power [Fire]
- Glare / Taunt / Giga drain / Synthetis
Azumarill set
Azumarill @ Choice Band
Ability: Huge Power
EVs: 84 HP / 252 Atk / 172 Spe
Adamant Nature
- Play Rough
- Waterfall
- Aqua Jet
- Knock Off / Superpower
Or
Azumarill @ Assault Vest
Ability: Huge Power
EVs: 240 HP / 252 Atk / 16 SpD
Adamant Nature
- Play Rough
- Waterfall
- Aqua Jet
- Knock Off
This is a cool core that I came up with while teambuilding.
These two Pokemon are great wallbreakers (Serp can wallbreak once it gets to +2) that remove each other's counters.
Serperior beats things such as Slowbro, Rotom-W and Ferrothorn, which Azumarill appreciates. Azumarill beats Pokemon that Serperior dislikes
such as Heatran and Altaria-Mega, as well as dealing heavy damage to Tornadus-T. These two Pokemon get walled by Venusaur-Mega and Will-o-Wisp Bulk-Up Talonflame, so partners such as Hidden Power [Flying] Thundurus, Swords Dance Talonflame, Tail Glow + Psychic Manaphy or Rock Rock Slide + Psychic Landorus-I are recommended.
Several moves can be run in the 4th moveslot on Serperior such as Giga Drain, Glare, Synthesis or Taunt. Giga Drain does pitiful damage at +0, but at +2 it can be used as semi-reliable recovery. Glare can be run to cripple fast offensive Pokemon such as Lati@s, Talonflame and Tornadus-T Synthesis provides reliable recovery, but gives checks free switch-ins. Taunt allows Serperior to act as a stallbreaker, locking opposing Pokemon out of recovery and status moves.
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