Zangoose does indeed need teammates to take out Ghost-types. Even if you opt for Night Slash over Quick Attack / Swords Dance, bulky Ghosts such as Cofagrigus can still take a hit or two and strike back. Spiritomb, Drapion, and Absol are probably some of the best Ghost-killers in the tier, Spiritomb for its decent bulk and STAB Ghost / Dark-type moves, Drapion for its access to Swords Dance and Taunt, and Absol, for its sheer power. Spiritomb's best set is the physical set in my opinion, as it has powerful STAB priority in the form of Sucker Punch and Shadow Sneak. Mixed forces you to spread your EVs across Attack and Special Attack, making it much less powerful and less effective. Special gets set up on.
Nidoqueen and Escavalier are huge threats in the tier, as they have the potential to power through almost anything. As for why there isn't an analysis page on them, it's because the analyses have not yet been written, as they have just been inducted into the tier. You can check out their analyses in progress in the
RU C&C Forum, though I think there's only a Nidoqueen analysis in progress atm. Moltres is also a huge threat, as it gained STAB Hurricane from BW2, meaning it now has the ability to 2HKO Slowking, a massive feat for any special attacker that doesn't possess super effective STAB moves against it.
Altaria is very uncommon in the RU metagame simply because it is very underwhelming. Its offenses are decidedly mediocre, while its defenses aren't that amazing either. Although it is one of the few Dragon-types in RU, it really doesn't fit in well with the fast-paced, hard-hitting RU metagame.
As for weather, it is pretty much non-existent. Despite the numerous amount of weather sweepers such as Kabutops, Omastar, Ludicolo, Victreebel, Charizard, Sawsbuck, and more, it's simply too difficult to maintain weather for so long. In addition, the multitude of priority users in RU makes it difficult to sweep even if you manage to keep weather up. Weather is always an interesting style to use, but it's difficult to pull off successfully in the current RU metagame.