How can someone predict how a format, that is not even announced yet, filled with Pokèmon whose stats we don’t know will turn out? Well you can’t, wich is why you should take everything I am going to say with a huge grain of salt.
Instead I am going to look at things that MIGHT be interesting for the upcoming format.
The first Pokèmon I want to look at is also one of my favourite designs: Oranguru. Starting with things we actually know both of its abilities are quite useful in doubles. Inner Focus stops the always common Fake Out while Telepathy has great synergy with its signature move Instruct. This move causes the targeted Pokèmon to immediately repeat the last move it used. Did you ever feel like your Garchomp’s Earthquake needed to deal double damage while leaving your second Pokèmon unscathed? If you did, then Oranguru is your ideal partner. Right now, it seems that it will be a support Pokèmon best paired with fast heavy hitters. The typing Normal/Psychic only has two weaknesses, which are Bug and Dark. Based on its design I predict low speed and strong bulk. How high these stats turn out will decide how important Oranguru will be in the upcoming meta. Its movepool will also play a huge role. I can see it getting Trick Room and Fake Out but these are very uncertain so lets move on instead.
Jangmo-o is mainly interesting because of its ability Soundproof. A dragon that is immune to Mega-Gardevoirs and Syleons Hyper Voice is bound to have some uses. Due to its revealed moves so far (Headbutt, Dragon Tail) I predict it to be a physical attacker along the lines of Haxorus. Its speedtier will be one of the crucial factors for its power.
Lycanroc-Day has quite a few interesting characteristics. Rock is a useful typing since it is great offensively and a counter to the always dangerous Talonflame. Sand Rush will be powerful if Tyranitar or Hippowdon have any place in VGC 17. Its signature move Accelrock is the first priority rock move and probably the biggest reason for excitement. I predict Lcanroc-Day to be a fast, fragile attacker that will make use of STAB Rock Slide and Accelrock to carve its niche.
Alolan Ninetales has an amazing offensive typing. The ultimate dragon hunter. Its viability will almost entirely depend on its speed and special attack. Should it be a prominent member of the new meta players will adapt and bring Bullet Punch on almost any team. Because of this I do not believe it will ever be dominant but a good fix for teams weak to Dragon.
Tapu Koko and Alolan Raichu have to be discussed together due to the obvious synergy of their abilities. Tapu Koko sets Electric Terrain on entry, while Raichu’s speed is doubled while Electric Terrain is active. These two share a typing in Electric and Earthquake as a weakness. Magnet Rise is a possibility but denies themselves the Electric attack bonus that the terrain offers. Raichus current speed is fairly high anyway wich makes the speed boost pretty irrelevant. This is why I hope that Alolan Raichu will have decreased speed and a significant boost in either bulk or special attack. Tapu Kokos signature move Nature’s Madness acts like an electric Superfang and will probably not be used much. I do not think the electric duo will have much of an impact and do not see an archetype developing around Electric Terrain unless more pokemon that benefit from it are released soon.
The most overhyped doubles pokèmon so far is probably Oricorio. Most poeple saw its ability and immediately tried to build combos with Volcarona, Salamence and Gyarados. The problem is that you have to protect your set up Pokemon either with redirection or flinching. Should Oricorio be a support Pokèmon that learns Follow Me or Fake Out, it will not have the offensive potential to make use of the free stat boost. If it is indeed offensive it will not be able to protect its partner properly. Aside from that it mostly looks like a gimmick to me and I don’t expect a high or even respectable BST from it. The concept could be promising but I am afraid I can’t believe the hype.
[Oct 4th 2016]