No way Ash is getting a Vikavolt, it's an Electric-type.
It made sense because of the opening and because of Electrium-Z, which is likely to turn into the special Z-crystal making electrium-z useless.
I'm hoping Ash gets Araquanid. It's more mobile, it's unique, and it's easier to draw.
As I've said before it is NOT more mobile than Golisopod, its only easier to draw because it has a less complex design.
And, if you're trying to use Z-Moves to prove that Ash should get Golisopod over Araquanid, Lycanroc can use fewer Z-Moves than Araquanid can.
Don't know why people are bringing up Lycanroc, since its not a water type. This was a which water type would be better for Ash argument, not a general which Pokemon best suits Ash.
Besides as I did bring up much earlier (few weeks to a few months ago), I do think the only reason Ash has Rockruff is because the rock type z-crystal would be the only thing he could realistically get from Olivia and it makes sense for it to happen.
And even though I don't expect it to, Golisopod can learn a rock type move, granted I don't think Rock Tomb is likely but would make a tiny bit of sense if they gave Ash a Golisopod. It can also learn a steel type move (matches Pikachu's Iron Tail), and a flying type move (for Rowlett's Pikipek), and fighting can be shared between Lycanroc, Incineroar, and potentially Jangmo-o and dark type moves with Litten, Lycanroc. Normal is obvious as well.
Araquanid on the other hand would have to rely SOLELY on new z-crystals outside of Normal and Dark, and I don't think Jangmo-o is going to help. Araquanid would only be able to share 2 z-crystals and it would have exclusive Z-moves, like Pikachu, unless Incineroar were to get Leech Life or Decidueye gets U-turn.
The argument that Ash should get Wimpod/Golisopod because it has more Z-moves at its disposable also hinges on Ash collecting all of the Z-crystals and right now, he has two, one of which is exclusively for Pikachu (and probably will be if Grubbin/Vikavolt never makes the team).
Maybe it depends more on how many Z-moves his Pokemon can actually share, if they are gearing up for Ash to use multiple Z moves during a single move, it would make more sense to give Ash Pokemon that can share MORE Z-crystals.
Pikachu-
Electric, Normal, Steel (don't expect Pikachu to have a new move)
Decidueye- Normal, Fighting, Flying, Rock, Bug, Ghost, Steel, Grass, Dark, Decidueye
Lycanroc- Normal, Fighting, Rock, Fire, Electric, Dark
Incineroar- Normal, Fighting, Flying, Ground, Bug, Ghost, Fire, Dragon, Dark, Incineroar
Golisopod- Normal, Fighting, Flying, Poison, Rock, Bug, Ghost, Steel, Water, Ice, Dark
Araquanid- Normal, Poison, Bug, Water, Psychic, Dark
Kommo-o- Normal, Fighting, Flying, Poison, Ground, Rock, Ghost, Bug, Ghost, Steel, Fire, Dragon, Dark
So I was slightly wrong, at most Araquanid would only be able to share Normal, Poison, Bug, Dark with the other Pokemon. Assuming of course the movesets DO NOT matter, and whether a Pokemon can learn a specific move or not as opposed to just being capable.
Meanwhile Golisopod would be able to share Normal, Fighting, Poison, Bug, Flying, Rock, Ghost, Steel, Ground with the other fully evolved Pokemon with only Water, and Ice being the odd ones out for uniqueness.
It's not just Golisopod has more Z-moves, its that Golisopod can share more Z-crystals with Ash's other hypothetical Pokemon over Araquanid. Again that makes more sense than Pokemon that shares fewer and relies more on unique Z-crystals. That being said Araquanid does give Ash access to the Psychic Z crystal.
Though maybe I'll wait till we know what Ash's 6th Pokemon would be, if it would be revealed before Wimpod or Dewpider capture if even that. If it is Jangmo-o then that would make sense.