Another excellent strategic combination that is capable of at once setting up hazards, and removing them from your side of the field, is Dialga and Volt Switch Forretress.
[Dialga@leftovers, modest, Stealth Rock / Draco Meteor / Fire Blast / Roar OR Thunder+ Forretress@ leftovers, calm, Spikes / Rapid Spin / Volt Switch / Toxic Spikes OR Pain Split]
[strategic]
[This combo is easily capable of applying huge pressure to any team variant, both through great bulk, and the combined utility of easily laying hazards while working together to ensure their eventual removal. When Forretress is brought into play, especially versus what it usually sets up on that cannot threaten it such as Chansey and Ferrothorn, Volt Switch can greatly reduce the negative impacts of prediction at the cost of a moveslot, and Dialga makes the perfect, bulky, strong partner to switch to. The two most common spin blockers are completely forced out by Dialga, who can also ensure chip damage on a fleeing Gira-O through Stealth Rock. This forces the opponent to either have to take the hit and lose their spin blocker, or switch and rack up more hazard damage, especially if one uses Roar Dialga, or certainly take a powerful hit. If one decides to include Thunder, a Ghost Arceus that switches into two layers of hazards, and gets paralyzed, will have a 100% chance of dying to Draco Meteor the following turn unless it runs SpD evs. Roar is obviously a great option as well to take advantage of your own hazards and beat stuff like Darkceus. The most important way to play this combo is to get it into action early. Whether you choose to lay hazards early, or simply start pressuring your opponents hazard core, which will be a match up based decision, the less time you allow them to take momentum through hazards the more likely you are to successfully break their spin blocking core.]
[Kyogre@leftovers,bold OR calm, but physically defensive, Roar/scald/rest/sleeptalk+Arceus Grass@meadow plate, Timid, specially defensive, Judgment OR Grass Knot/ WoW/ Recover/ Ice beam]
[Defensive]
[This combo has excellent synergy, in many ways. Obviously they share great type synergy, and kyogre removes one of Grass Arceus' weaknesses. But they also counter many threatening Pokemon, and combinations of Pokemon, while matching up well versus most team archetypes. Kyogre can easily absorb Ice attacks, and even dragon attacks if you run a SpD set from Kyu-w, but most importantly it can check Ho-oh, and restore rain while doing so. Grass Arceus can check Palkia, zekrom, dialga in the rain, and many other Pokemon likely to attempt to threaten Kyogre. Another added benefit is the extreme likelihood that Ferrothorn will get burned against this combination, which makes it unable to force out Grassceus unless it carries toxic.]
