Seismitoad is based on a toxic toad; it has Sludge Bomb, Sludge Wave, Poison Jab, and Poison Touch. This is the segway into the next question:
What if Seismitoad got Toxic Spikes?
Seismitoad would easily be the best Toxic Spikes user in NU. It has better typing and bulk than Scolipede, and Garbodor is already mostly outclassed by Scolipede to begin with (other than Acid Spray + Focus Blast/Dark Pulse). It also has Earth Power/Earthquake to deal with grounded Poison-types (mostly Skuntank) that like to switch in and absorb the T-Spikes. I see a double hazards lead being popular:
Seismitoad (M/F) @ Leftovers
Trait: Poison Touch/Water Absorb
EVs: 252 HP/252 SpA/4 Spe (0 Atk IVs)
Nature: Modest/Bold
-Stealth Rock
-Toxic Spikes
-Earth Power
-Hydro Pump/Grass Knot
The hazards are self-explanatory, and Seismitoad's bulk is actually pretty good once you consider that giant HP stat and few weaknesses. Earth Power is the most reliable STAB to hit grounded Poison-types, as well as Electrode, Zebstrika, Camerupt, etc. Hydro Pump is preferred as a secondary STAB for Ground-types (though it still won't do a ton to Torterra) plus Bastiodon and other vulnerable Pokemon. However, the Water-Ground coverage is not great offensively, so Grass Knot is a nice alternative to hit Pokemon such as Walrein, Dewgong, Torterra, and other Seismitoad. Grass Knot also has the nice bonus of being a direct attack, thus potentially activating Poison Touch.