Dragalge @ Black Sludge  
Ability: Adaptability  
EVs: 248 HP / 232 SpD / 28 Spe  
Calm Nature  
- Draco Meteor  
- Sludge Bomb  
- Flip Turn  
- Toxic Spikes  

Dragalge @ Heavy-Duty Boots  
Ability: Adaptability  
EVs: 120 HP / 252 SpA / 4 SpD / 132 Spe  
Modest Nature  
- Draco Meteor  
- Sludge Bomb  
- Hydro Pump  
- Flip Turn  

Thoughts: Dragalge has a really nice typing. A Dragon that scares out Fairies is nice and it sets Toxic Spikes, which are really good since the most viable Poison-types are itself, Salazzle and Venusaur. Adaptability Draco Meteor and Sludge Bomb are really powerful and Flip Turn allows it to get out of sticky situations. It can also run Hydro Pump on a more offensive spread to scare out Grounds.

Checks: Steel-types like Copperajah and Klefki do well against it since it can't hurt them back. While it can't switch in, Latias is able to tank a Poison or Water move while threatening it out, thus removing its Toxic Spikes or attacking an incoming Pokemon.

Partners: Spectrier can abuse Toxic Spikes, so it can free up Will-O-Wisp for something else. Bulu can check Ground-types for it and it can lure Flying-types and beat them with Stone Edge to make Toxic Spikes more effective.