Hisuian Samurott

Hisuian Samurott actually has a higher Attack stat than normal Samurott, and it also has access to Water Fall. This alone means that it's a Pokemon with genuine potential for the future, but it's definitely going to need Hydro Cannon to see genuine utility in that future. It's okay as a Water or Dark Type as-is, but it's also not exactly great.

Best PvE Offensive Moveset

• Waterfall and Razor Shell is the way to go for a Water Type moveset
• Snarl and Dark Pulse is the pick for a Dark Type moveset
• Fury Cutter and X-Scissor can work if in a pinch, but  it's pretty underwhelming.
• Icy Wind isn't worth considering.

Best PvE Defensive Moveset

• Waterfall is the best overall option for a defensive Fast Move due to its higher power, though Snarl is also good. Both have great neutral coverage, so the best option depends on the Charged Move of choice.
• Razor Shell is a contender for Charged Move option thanks to STAB, and it also comes out frequently and is very hard to dodge.
• Icy Wind has coverage against a number of threatening Pokemon and is definitely worth considering.
• X-Scissor is great as well, though it's more frequently resisted.
• Dark Pulse has high power and neutral coverage, but it doesn't come out as frequently.

Fury Cutter provides high energy generation, allowing Hisuian Samurott to spam Icy Wind for debuffs or Dark Pulse for raw damage.