Alright, so I'm still working on the entry for the defensive set, but I've got the offensive set done, so I figured I'd post it now.
Dragalge @ Draco Plate
Ability: Adapability
EVs: 200 HP / 252 SpA / 56 Spe
Modest Nature
- Toxic Spikes
- Draco Meteor
- Sludge Wave
- Focus Blast / Hidden Power Fire / Scald
Role: Hazard Setter
What It Does: While it has previously been more famous for its Specs Wallbreaking set, Dragalge can also greatly benefit offensive teams by virtue of being one of the only OU viable Toxic Spikes setters that can also maintain a good offensive presence. Toxic Spikes, while definitely trickier to pull off than other hazards thanks to its limitations (it can't affect Steel, Flying, or Poison types, or Pokemon with Levitate, and will be removed if a grounded Poison type switches in), they can greatly improve offensive teams' matchups against both stall and against setup sweepers. Dragalge's great defensive typing means it can usually find plenty of opportunities to set up Toxic Spikes as well. Draco Meteor maintains a very high power thanks to Adaptability, allowing Dragalge to do a lot of damage to anything that tries to switch in that isn't a Fairy type, Steel type, or Chansey. However, the special attack drop means that Dragalge will likely have to switch out afterwards. Sludge Wave is also boosted by Adaptability, and gives Dragalge a way to nail every Fairy except Klefki if they try to switch in. And, since you're not Choice-locked on this set, Fairies switching in on a Draco Meteor are much less of a problem. DO NOT use Sludge Bomb instead, as the extra poison chance is irrelevant if Toxic Spikes are down, the difference in power, while not big, is still noticeable, and it can't hit Chesnaught. The last slot is for coverage against Steel types, who resist Draco Meteor and are immune to Sludge Wave. Focus Blast does more damage overall, is capable of hitting Heatran, hits Tyranitar and Bisharp harder than any other attack, and is Dragalge's best option against Chansey (though it's still not a great matchup). Alternatively, Hidden Power Fire can be used if accuracy is an issue, and it is Dragalge's best option against Scizor and Ferrothorn, though it does less to most other Steel types, and makes Heatran a hard stop. If Steel types aren't a big problem for the rest of your team, Scald could be used instead to hit Ground types harder on the switch in, while still being able to hit Heatran. The given EVs maximize Dragalge's SAtk and give it enough speed to outspeed uninvested Azumarill, with the rest going towards Dragalge's bulk. Draco Plate is the recommended item to let Draco Meteor do as much damage as possible, and even bluff a Specs set. Black Sludge could be used instead to give Dragalge a means of recovery.
Good Teammates: Anything that appreciates having grounded Pokemon poisoned will enjoy Toxic Spikes support from Dragalge. Mega Gyarados is one such Pokemon, as most of its counters are susceptible to Toxic Spikes and it shares excellent type synergy with Dragalge. Both Charizard X and Charizard Y benefit from SubCM Keldeo being weakened. An interesting partner might be Mega Tyranitar. A lot of the reason Mega Tyranitar has fallen in viability lately is due to the prevalence of counters such as SubCM Keldeo, Mega Lopunny, and the Fairy-dominated metagame, Nearly all of those are very susceptible to Toxic Spikes. Magic Guard Clefable and Non-Mega Altaria can avoid them, but are very susceptible to Sludge Wave if they try to switch in. In return, Mega Tyranitar can take on the Ice and Psychic types that trouble Dragalge. However, neither are great against Steel, and both are weak to Ground, so the rest of the team would need to be able to take them on. Kyurem-Black can be a good partner to support Dragalge, as it too appreciates the weakening of Fighting types, and appreciates Dragalge's ability to take on Fairy types as well as its Fighting resist. Meanwhile Kyurem-Black can take on Steel types thanks to Earth Power, and can take on the Ground types that tend to force Dragalge out. Since Dragalge does not have any form of healing outside of Black Sludge, which is not the primary item it should be running, cleric support could also be useful. Also, since you don't want your opponent eliminating your Toxic Spikes, Bisharp would be a great partner, as it deters defogging, can Pursuit trap the Latis, and can take out the Psychic types that are strong against Dragalge. Since Steel types can prove difficult to take on even with a coverage move, partners that can trap and remove Steel types, such as Magnezone and Dugtrio, are very helpful.
What Counters It: Many Steel types can wall Dragalge even
with a coverage move. Also, with base 44 speed, Dragalge isn't gonna be winning a lot of races any time soon. As such, any Pokemon that can outspeed Dragalge and hit it with a super-effective attack (which is quite a lot of Pokemon) can counter it pretty easily. There aren't a lot of things that can switch in to Dragalge's STABs safely, but there are a few. Heatran can shrug off both of Dragalge's STABs, making it a safe switch in unless Dragalge's owner predicts it and lands a Focus Blast. While Heatran can only 2HKO Dragalge after Stealth Rock with Earth Power, Focus Blast's less than reliable accuracy means that staying in is risky. If Heatran isn't hit on the switch it
will force Dragalge out, costing momentum. The Lati twins can be an absolute nightmare for Dragalge. While they can't switch in on Draco Meteor, Dragalge cannot switch in on either of them either, as both of them are capable of OHKOing Dragalge with both STAB attacks. Both can also Defog away any Toxic Spikes. Starmie is threatening for similar reasons. Ground types are a very big threat to Dragalge as well. Excadrill in particular can easily take down Dragalge, and is immune to Toxic Spikes. Dugtrio cannot take a hit, but if it gets a free switch in, Dragalge is dead. While there aren't a lot of Poison types around in OU to absorb Dragalge's Toxic Spikes, there is one in particular that does stand out. Mega Venusaur can absorb Toxic Spikes, and can tank pretty much anything Dragalge tries to throw at it.
Any Additional Info: The EV spread given is the one I've been using. It seems to work pretty well for me, but I can't promise that this is the absolute best. Over on the revamped analysis currently in QC, the listed EV spread is 228 HP / 252 SAtk / 28 Spe, to give it more bulk while still outspeeding Hippowdon. Feel free to correct me if there's a consensus about a better EV spread.