>>31505566Blastoise's main niche is of a Spinner. It is generally outclassed in any other sense, though it also has a niche in its wide coverage options.
It can also run a gimmick Scarf/Water Spout set, but this is not very good.
I'd go with
Fightinium-Z/Steelinium-Z/Darkinium-Z
Rapid Spin
Scald
Aura Sphere/Flash Cannon/Dark Pulse
Roar/Ice Beam
Basically, Blastoise pulls double duty as your spinner, and an eliminator of a specific threat your team needs rid of. The Z-Move should OHKO, provided you score a properly rused SE hit. Otherwise, just spam Scald. Ice Beam is for if you really need that coverage, but I'd favor Roar for the utility, since Blastoise is mostly centered around specific moments anyways.
If your Z-Slot is taken, Blastoise can run a decent enough AV set, since it has such nice coverage, and can still do utility work while wearing it. If going AV, I'd suggest
Rapid Spin
Scald/Hydro Pump
Dark Pulse
Aura Sphere/Ice Beam/Flash Cannon
