These Pokémon have a really cool combination of unique designs, abilities, and movesets:
Brambleghast (Typing: Grass/Ghost) - Gets Wind Rider as its ability, which boosts it's Attack when Tailwind takes effect, or if the Pokémon is hit by a wind move. Also takes no damage from wind moves, which is huge for a Grass type. Hits hard with Power Whip and Phantom Force. Acts as a Rapid Spinner and spinblocker. Wasn't crazy about the pre-evo, but the final evolution looks amazing. Is let down by a low HP stat.
Garganacl (Typing: Rock) - Has great defenses, Wide Guard, Stealth Rock, and Recover. Purifying Salt is an interesting ability, because it halves damage from Ghost moves, and protects it from status moves. Ghost teratype could be really popular for this mon, removing the weakness to Fighting, and not having to worry too much about Ghost moves. Salt Cure is an interesting move for what will be a stall mon.
Glimmora (Typing: Rock/Poison) - It seems like this Pokémon's one calling is to inflict poison. Has Toxic Debris which sets Toxic Spikes when hit with a contact move, and Corrosion, as abilities. In addition to Toxic Spikes, it has Stealth Rock and Spikes. It can protect itself with Spiky Shield to help it set entry hazards throughout the match. Also has Acid Armor to boost its already good Defense. If the opponent expects you to be passive, you can set up with Rock Polish and sweep with Sludge Wave and Power Gem... did I mention that it has 130 Sp. Atk? I mean, this thing is evil.
Meowscarada (Typing: Grass/Dark) - Flower Trick seems OP. Always thought there should be a move that always hits and crits, but now that it's come with a Pokémon that already has Protean I don't know what to think. Also gets Knock Off and Play Rough... and U-Turn to reset Protean.