Inteleon

Inteleon boasts the highest Attack stat among all non-Mega Water Type starters, sitting just behind Mega Blastoise This means that it has a lot of future potential, in particular after it's inevitably granted access to Hydro Cannon. But, for now, it's a little bit on the low end of damage. Still very much usable, but definitely behind its future potential.

Also, Inteleon has a Gigantamax forme in the main series, so there may be more to this water-lizard with a Golden Eye than what we have access to currently.

Best PvE Offensive Moveset

• Water Gun and Surf is the best moveset that Inteleon can muster short of a future Hydro Cannon.
• Pound, Water Pulse, and Shadow Ball all fall behind.

Best PvE Defensive Moveset

• Honestly, all of Intelon's moves have defensive utility. Pound is a bit stronger, though Water Gun is comparable post-STAB.
• Surf and Water Pulse are pretty interchangeable. The former has a shorter animation, while the latter has more raw power.
• Shadow Ball has great neutral coverage and high damage output.

Water Gun outpaces Pound, Surf comes out quickly and has decent power, and Shadow Ball has high power and great neutral coverage for a relatively low cost. It's as simple as that.