Team Rocket Ghost Type Grunt Guide

Hydreigon with Bite and Brutal Swing can take quite a few hits, just like any Dark type, and dish out great damage in return. Though make sure you save a Brutal Swing against Froslass in the final slot who's Powder Snow can hurt Hydreigon.

Much like Hydreigon, Tyranitar can easily take any Ghost type attacks that get thrown at it with ramping damage from Bite and a Brutal Swing for good measure. Though it doesn't appreciate Mud Slaps from Golett.

Sometimes you just gotta fight fire with fire, or ghost with ghost I guess... Giratina Origin form is a more tankier Ghost type that can deal a good amount of damage as well. It can be spammy with Ominous Wind and grab a potential attack and defense boost along the way or deal devestating damage with Shadow Ball or Shadow Force. Just make sure it has Shadow Claw and not Dragon Tail.

Giratina's Altered Forme has the advantage of being able to run Shadow Claw and Dragon Claw. And while it may look like Dragon Claw is inferior here, its low energy cost combined with Shadow Claw's high energy gains means that it can frequently stun-lock opposing rockets, allowing them only one or two fast move uses per charged move that Giratina launches.

If anything is weak to Ghost, Dawn Wings Necrozma is going to pop up and for good reason. With an absurdly high attack stat and having access to Shadow Claw it can make quick work of any ghost types standing its way. Though it's more than allergic to Ghost itself being double weak to it, which in reality won't hinder it too much. Oh how nice it is to have an amazing attack stat.

Excadrill has good coverage against anything in the last slot with Mud Slap, Scorching Sands for Gengar and Alolan Marowak or Rock Slide against Froslass or Alolan Marowak. But please keep in mind that with the right fast move, Alolan Marowak can melt Excadrill quite easily.

Gengar is definetly a solid choice here. The only problem is that you might want to bring multiple as it's quite glassy whilst also taking super effective damage from Ghost type moves. Just make sure you're using Shadow Claw along with Shadow Ball.