Neutralizing Gas
Storm Drain
Triage
Download
Punk Rock
Reasoning as follows: Neutralizing Gas takes care of a large number of our desired targets, and does so in a way very few other pokemon currently do. It's untapped potential that would be fun to explore.
Storm Drain gives a water immunity so we can avoid scald burns hurting our physical attacks and nab a free +1 special attack, both of which are great for taking on Slowbro and Slowking.
Triage is interesting because of just how big of a priority boost it is, +3 priority is extremely rare and is guaranteed to put us ahead of basically everything. Potentially combining that with strength sap and STAB Leech Life is an exciting thought.
Download improving whatever matchup we currently find ourselves in could be nice as well. Just a simple +1 to a stat but it gets the job done, and makes it more effective at breaking a pivot or smacking a switch-in.
Punk Rock I just don't see following this concept much at all. It's a flat damage buff and a resistance to sound moves which is okay, but just doesn't inherently synergize as well with the concept nearly as well as the others do.