I have now decision for who I choose in my team... Mimikyu or Palossand?
What do you think? Which one has more potential?
Well, let's break this down:
Defensive: Pallossand is sure to have better Defensive stats, along with the potential to boost via Water Compaction, while Mimikyu has the advantage of Disguise protecting it from a hit. As far as Typing is concerned, Mimikyu is only weak to Ghost and Steel, while resisting Bug (x4) and being immune to Fighting, Normal, and Dragon. Pallossand has more weaknesses (Water, Grass, Ice, Ghost, Dark), but also more resistances (Bug, Poison [x4], Rock) and just as many immunities (Normal, Fighting, and Electric). All in all, I say Pallossand come out on top here, though not in a landslide.
Offensive: Both Mons have great STAB combos, with Ghost/Fairy not being resisted by anything in the Alola Dex (at least in regard to the Type combos we currently know). We can also confirm that it gets Thunderbolt for coverage, though my guess is, given its big ole' ghost claws, that it's Physically oriented. Pallossand seems to be Specially oriented, and we know it gets Earth Power and Shadow Ball, so that is a big boon on its part. It also gets Mega Drain, which is awesome for both coverage and recovery. I say Pallossand and Mimikyu tie on this one, as Pallossand has more in terms of confirmed potency, but Mimikyu has serious potential.
Support: Both are sure to get Will-O-Wisp, and so that's serious points in both columns. Since Mimikyu learns Thunderbolt, Thunder Wave seems likely , and it looks like (based on the most recent trailer) Mimikyu learns Charm, which is a fun option. Pallossand gets Sand Tomb, and that constant damage will be nice early game when its a little Sandyghast. In the end, Mimikyu wins this category, especially since Disguise benefits it greatly on the support front, as it can switch out to tank a hit when necessary, no problem (well, the first time it gets hit there's no problem, at least).
Verdict: As Axelsaurus said, we won't be sure until the games drop, but for now Pallossand looks like the way to go if you want power and bulk, while Mimikyu is for you if your team could use support and perhaps a bit of versatility.