Chimpanzory: A mono-Fighting monkey is something we already have, but it is very different to Brawnkey. However, I don't know if this thing would be balanced. It gets very powerful offensive moves like Light of Ruin (and lots of health to burn) and Hydro Pump, as well as actually getting Focus Blast as a Special Fighting type, all while punishing switches with Analytic or getting more crits with Super Luck.
Magicida: A very good Trick Room mon, but it unfortunately can't set it. Regardless, it gets a solid amount of coverage, like Play Rough and Poison Jab, as well as utility and other options, like Spikes and First Impression. Rattled is intereting, since it's weak to all the types related to it, but it has enough bulk to where it might be able to take a hit, and Dragon Dance once to be at +3 Speed and possibly take on slower mons. Poison Touch is probably its best ability though. It might be a bit much, but it's hard to judge.
Spinium: Boomburst, Oblivion Wing, Psychic, Flash Cannon, and Frost Breath, on top of 174 SpA and a Steel typing, as well as Slack Off and decent bulk. Sure, it's 4x weak to Fighting, but it also has all of Steel's resists. Also, this thing has a lot of Flying traits. Big Pecks and plenty of Flying moves. Probably not a good idea.
Voltarak: Ice/Electric has a lot of weaknesses and not too many resists, but for what it's worth, it can work. It can go for Elemental power in Ice Beam, Thunderbolt, Fiery Dance, and Energy Ball. If you want a different type of coverage, you can run Technician boosted Hidden Power. Finally, it's fast enough to run a Scarf, and you can use Switcheroo to cripple your foe. Overall, I like it, but we have quite a few Electric types already.
Fiemeleon: Fast specially defensive utility, with a decent offensive option in Fusion Flare, good coverage, recovery via Cheek Pouch and Milk Drink, protection via King's Shield and Spiky Shield, and for some insane reason, both Agility and Autotomize. We do need more Fire types, but we already have a mono-Fire type that happens to be a reptile. I guess it's not unreasonable, but it's not my first pick here.