I would suggest you Araquanid. Araquanid has the ability Water Bubble which doubles its Water moves, makes it immune to burns and gives it pseudo-fire resistance. If this is only a list currently and has yet to be built, then that's great as Araquanid destroys Totem Alolan Marowak. Although it will be stuck for quite a bit with special Water moves, Water Bubble compensates for it until it learns at arund level 58 or something Liquidation. Only problem is low Speed and type-stacking with Vikavolt but if you don't mind it, then you can pick that.
If type stacking is a problem, you can alternatively use Gyarados. Take a Flyinium Z from Ten Carat Hill, teach it Bounce from Akala Beach Tutor and Aqua Tail from Ula'Ula beach tutor. + Intimidate is also really good. Don't need to elaborate much on Gyarados if I have to be fair.
Just don't use Slowpoke, you will later regret it.
I don't have much experience with it, but I'd avoid using Golisopod as Wimpod is pretty bad until level 30 and as such can't be used for Totem Alolan Marowak where it would be the most useful.
Bruxish is another option, although Psychic typing is pretty bad in Alola due to the abudance of Ghost, Dark and Psychic typ. However, Strong Jaw boosted Psychic Fangs hits like a truck on anything that it hits neutrally
that's what I can think of atm, hope you consider them.