Now that Drizzle is gone, I have been using Hippowdon + Choice Band Stoutland since sand is the next best weather (most balanced weather imo) and Stoutland is just such a boss now that it has that juicy base 110 Attack stat. I use Stoutland as either a early-game wallbreaker or a late-game sweeper. As a wallbreaker, I usually switch Hippowdon in on a move it can stomach, set up Stealth Rock, and then either just leave it as a death fodder if I don't see anything on the opposing team it needs to deal with, or preserve it by switching into one of my two other defensive mons (I use AV Metagross and Latias btw). Sooner or later (but the sooner the better), Stoutland comes in and just starts to utterly destroy everything, for example, it always 2HKOes 252/252+ Eviolite Chansey after Stealth Rock with just Return (Superpower shouldn't be used in this case, since it also only 2HKOes and has those nasty drops :o). With Chansey gone, I can sweep with my Thundurus-T or Latias late-game with little to no worries. The only thing that stops me are annoying Ghost-types since I can't spam Return, but in that case, I use Stoutland as a late-game cleaner. The latter is a bit harder to do, since you not only gotta preserve Stoutland, you also gotta preserve Hippowdon so it can set up the sand, as without the sand, Stoutland is fairly easy to revenge kill
Also, I have been using this set with a lot of success recently:
Metagross @ Assault Vest
Ability: Clear Body
EVs: 252 Atk / 44 Spd / 212 HP
Adamant Nature
- Meteor Mash
- Bullet Punch
- Earthquake
- Zen Headbutt
Now I know that many people have already talked about Assault Vest Metagross, but I'll go into more detail here and also offer up an EV spread that you might be interested in. Metagross checks many of the top threats in the metagame, such as Mega Gardevoir, Latias, and Keldeo among others. Assault Vest combined with Metagross's already fantastic base 130 Defense enables it to act as an amazing mixed wall who also has a threatening offensive presence. For example, Mega Gardevoir only has a 4% chance to 2HKO with Shadow Ball while Metagross always OHKOes with Meteor Mash. Speaking of which, Meteor Mash allows Metagross to OHKO every common Fairy in the metagame (Florges, [Mega]Gardevoir, and Whimsicott), in fact, the only Fairy-type that Meteor Mash can't always OHKO is 252/252+ Granbull, although it sill has a 12.5% chance to do so (Intimidate doesn't affect it due to Clear Body!). Also, if Metagross gets the Attack boost from Meteor Mash (common), then it is going to wreck pretty much everything. Bullet Punch provides a reliable form of priority, letting Metagross deal with Weavile after Stealth Rock, a Pokemon that Metagross would otherwise fear. Earthquake is there to hit the good ol' Steel-types, almost always OHKOing Bisharp as well as dealing respective damage to other Metagross, do note that you need to hit them on the switch for this to happen, as Bisharp is faster than you and speed ties can ruin your chances against other Metagross. More importantly, Earthquake deals with Fire-types such as Victini, Mega Houndoom, and Darmanitan, but again, you need to hit them on the switch or all but Mega Houndoom will win. Zen Headbutt is a useful secondary STAB that lets you obliterate Keldeo, Dragalge, and Toxicroak, even though the latter two aren't that common. As for the EV spread, 44 Speed EVs are used to outspeed Mega Heracross that invest solely in HP and Attack by one point, so Metagross can win against them due to Zen Headbutt 2HKOing while Mega Heracross failing to 2HKO back. Obviously, Metagross has its faults, and the most important one is its new-found weakness to Dark-types. This makes Mega Metagross extreme Knock Off-bait, and allows for Bisharp, Sharpedo, and Honchkrow to deal with it. Furthermore, because it's running Assault Vest, Sucker Punch will always hit it and you can't play mind games around that (not that it would work anyway..), and the fact that these things are really common in the metagame definitely degrade Metagross; despite this, Metagross is still a potent threat that every team must prepare for.
Also, can we please not talk about the tiering of Pokemon like Kangaskhan, Mawile, and Pinsir; it's really annoying because those three are very irrelevant, since if their Mega stones are not banned (aside from Kanga ofc), they'll be OU, and if they are banned, they'll drop from UU and most likely have no viability here.
Also, I have been using this set with a lot of success recently:

Metagross @ Assault Vest
Ability: Clear Body
EVs: 252 Atk / 44 Spd / 212 HP
Adamant Nature
- Meteor Mash
- Bullet Punch
- Earthquake
- Zen Headbutt
Now I know that many people have already talked about Assault Vest Metagross, but I'll go into more detail here and also offer up an EV spread that you might be interested in. Metagross checks many of the top threats in the metagame, such as Mega Gardevoir, Latias, and Keldeo among others. Assault Vest combined with Metagross's already fantastic base 130 Defense enables it to act as an amazing mixed wall who also has a threatening offensive presence. For example, Mega Gardevoir only has a 4% chance to 2HKO with Shadow Ball while Metagross always OHKOes with Meteor Mash. Speaking of which, Meteor Mash allows Metagross to OHKO every common Fairy in the metagame (Florges, [Mega]Gardevoir, and Whimsicott), in fact, the only Fairy-type that Meteor Mash can't always OHKO is 252/252+ Granbull, although it sill has a 12.5% chance to do so (Intimidate doesn't affect it due to Clear Body!). Also, if Metagross gets the Attack boost from Meteor Mash (common), then it is going to wreck pretty much everything. Bullet Punch provides a reliable form of priority, letting Metagross deal with Weavile after Stealth Rock, a Pokemon that Metagross would otherwise fear. Earthquake is there to hit the good ol' Steel-types, almost always OHKOing Bisharp as well as dealing respective damage to other Metagross, do note that you need to hit them on the switch for this to happen, as Bisharp is faster than you and speed ties can ruin your chances against other Metagross. More importantly, Earthquake deals with Fire-types such as Victini, Mega Houndoom, and Darmanitan, but again, you need to hit them on the switch or all but Mega Houndoom will win. Zen Headbutt is a useful secondary STAB that lets you obliterate Keldeo, Dragalge, and Toxicroak, even though the latter two aren't that common. As for the EV spread, 44 Speed EVs are used to outspeed Mega Heracross that invest solely in HP and Attack by one point, so Metagross can win against them due to Zen Headbutt 2HKOing while Mega Heracross failing to 2HKO back. Obviously, Metagross has its faults, and the most important one is its new-found weakness to Dark-types. This makes Mega Metagross extreme Knock Off-bait, and allows for Bisharp, Sharpedo, and Honchkrow to deal with it. Furthermore, because it's running Assault Vest, Sucker Punch will always hit it and you can't play mind games around that (not that it would work anyway..), and the fact that these things are really common in the metagame definitely degrade Metagross; despite this, Metagross is still a potent threat that every team must prepare for.
Also, can we please not talk about the tiering of Pokemon like Kangaskhan, Mawile, and Pinsir; it's really annoying because those three are very irrelevant, since if their Mega stones are not banned (aside from Kanga ofc), they'll be OU, and if they are banned, they'll drop from UU and most likely have no viability here.