>>22015343Venoshock is tempting, but necessitating Toxic Spikes is bad, considering a few things:
1. If your opponent has a Poison type Pokemon that's grounded, you've wasted two moveslots.
2. Toxic Spikes is easily the least reliable hazard, as Flying/Levitating/Steel/Poison mons are all immune (Poison absorbing).
3. Steel types immune to both TSpikes and Venoshock (while still resisting your Dragon STAB).
The appeal is that you have a Draco Meteor tier move you can spam, but in reality, you can't spam at all because a third of your opponent's mons are going to be immune to it at any given point in time, and you can't always assume that you'll manage to land the TSpikes on the other 2/3rds.
Considering running TSpikes on another mon simply to support this one is not a good or worthwhile plan, it means Dragalge will have to setup its own TSpikes, which means you get one before you're at half health and outsped, and also not being able to use either Assault Vest or Specs.
If you do decide to use another mon to setup TSpikes, it's not terrible. You can easily slot Venoshock into the fourth slot and use it as a rare high power nuke (that could also proc from a Sludge Bomb used earlier in the match).
Venoshock may not find its way into standard sets, but it'll be useful on Toxic Spikes Black Sludge Dragalge, despite its inefficient use of its ability and even narrower niche.
Maybe something like:
Dragalge @Black Sludge
Adaptability
Modest
252 HP 252 SpAtt
-Toxic Spikes
-Venoshock
-Protect/Draco Meteor
-Draco Meteor/Scald
Setup TSpikes when you can/when opposing Poison type is gone. Scald the switch-in early game for burns or Draco Meteor for damage. Protect makes you a better setter with increased BSludge recovery for longevity. Can technically slot in Dragon Pulse in last slot to make use of its ability, but at that point you may as well slot Draco Meteor to punish switch-ins better since this set isn't auto-attacking.