Politoed
Politoed brings Drizzle, which will reduce damage of fire type moves that may be used on Maractus. Also, if your Maractus has Water Absorb, he can use surf to heal Maractus a bit. He also Gets Surf and Ice Beam to cover Maractus' Fire and Flying weaknesses.
Ninetails
Ninetails brings Drought, which if your ability is Chlorophyll will double Maractus' speed.He can also use any fire type move to counter Maractus' Bug weakness, and has access to a decent amount of Support moves like Safeguard and Confuse ray/Will-o-Wisp.
Cherrim
Cherrim can use Sunny Day to activate Maractus' Chlorophyll. And its own ability, Flower Gift will give Maractus a Boost to its Atk and Spdef. It gains access to some decent support moves like Aromatherapy,Worry Seed and Flower Sheild.
Florges
Florges has a ton of supportive moves for Maractus. Grassy Terrain Will power up Needle Arm/Seed Bomb(Seed bomb is preferable) and heal Maractus a bit every turn. Aromatherapy to heal status conditions, Light Screen/Flower Sheild to boost your defenses, and Safeguard to prevent the use of Status Moves on Him.
as for Maractus Jolly will help it outspeed threats anda Life Orb/Expert Belt can increase its damage.
Hope I helped.
