Here is the current type count as of Rubyroot being added
Artificial: 4
Beast: 3
Mineral: 2
Ghoul: 1
Piscine: 1
Slime: 1
Avian: 1
Plant: 1
Arthropod: 1
Reptile: 0
Unfortunately, this is why I don't think that Mechachnid should be added at the moment. The meta is oversaturated with Artificial types at the moment, and adding Mechachnid means that half of the current meta would be at least part Artificial. Everything else is good about it though, it would be the first fast physical attacker in the meta (with Hyperactive to go even faster). If there is a rejected mons slate at the end, and the type count has been evened out, I would definitely want Mechachnid to get in.
Gooze: Currently, both of Gooze's abilities have no effect (unless you decide to run Conifer Cannon on Rubyroot, but there aren't even any Reptile types yet). It's moveset is pretty interesting, as it gets Seagull Swipe (a great recovery move), Brambles (hazard), and Primal Instinct (pivoting). It's main problem is that it's SpD leaves much to be desired.
Sardinner: This seems pretty similar to Tarpidgeon, as both are Piscine physical walls. While Tarpidgeon has better defensive stats, Sardinner has a better support movepool and a better ability in Catchweight (effective against 6 of the current 10 pokemon)
Lycanflex: The first of the Ghoul/Beast pokemon this slate. We already have a Ghoul type Special Wall in Spirox, and Lycanflex's stats are a more extreme version of Spirox's (3 Defense lmao).
Weripped: Like as I said with Gooze, we don't have any weather or terrain yet, so this would probably run Chilly Armor. Suspend is really cool move, but Weripped has poor defenses so I don't think it is worth it. What could be worth it is Call of the Wild, which grants +1 SpD to Weripped and gives it passive recovery. It will probably have to use Primary/Secondary Blast for its attacking options with it's big SpA.
Who i'm voting for is either
Mechachnid or None