>>31989386Forgot to add to this
>>31990565...
Infestation is also viable, as it traps mons and does work on both Poison and Steel types, and stacks damage with Toxic, and removes a solid percentage of health.
That said, Scald's high BP, burn chance, and STAB all compensate for Toxapex's low attack stats. It's rather a toss-up between Infestation and Scald, but Scald is generally better on average, against the average team. Though Infestation often does fuck up Stallfags supremely hard, making Toxapex the chemo to itself.
Anyway, while there is a case to be made for either Scald or Infestation, there is no reason to ever use Liquidation. It's just bad In every way, bad. Not as a move itself, it's quite good on some other mons, but on Toxapex? No, never ever use it on it.