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Changes in red, old version in white

Hydreigon@Life Orb
Levitate
Mild
252 Spe / 252 SpA / 4 HP
- Draco Meteor
- FlamethrowerFire Blast
- Superpower
- Dark PulseRoost
On my old team I use special Nidoking as an incredible damage dealer, hitting several OU threats for super effective damage. I wanted to try out Hydreigon in a similar role for my new team, for many of the same reasons. It hits equally hard (unfortunately, it takes Life Orb damage for the same amount of power as Nidoking) but has different coverage, and has more speed. The object of Hydreigon is to come in at the end after everything is weakened and end the game in my favour. The problem? Hydreigon’s base 98 speed and weakness to Mach Punch. The solution? Heavy paralysis and hazard report. Which is why I added...

Gyarados@Leftovers
Intimidate
JollyImpish
248 HP / 252 Def / 8 SDef
- Rest
- Thunder Wave
- Sleep Talk
- Dragon Tail
This Gyarados setup is engineered so as to always outspeed Breloom, getting off a taunt or thunder wave guaranteed. New spread is for maximum physical bulk, which means maximum RestTalk survivability. Dragon tail helps to shuffle pokemon around, which will be helpful for when hazards are up and helps me spread paralysis. Waterfall is my standard STAB. Changed to a RestTalk set which has proven more effective in staying around longer to spread paralysis to the eneemy. Although I could use the coverage given by bounce, I prefer the 100% paralysis of thunder wave over the 30% chance. However, Thunder Wave can’t hit ground types, which leads me to...

Jirachi @ Leftovers
Serene Grace
Careful
252 Hp / 252 SDef / 4 Spe
- Body Slam
- Iron Head
- Stealth Rock
- Wish
EVs allow me to outspeed Breloom again (I bloody HATE Spore) As much special bulk as possible to absorb Draco Meteors and Hurricanes. I also have further paralysis support in the form of a 60% chance from Body Slam, plus Wish for healing Gyarados and my other hazard setter-upper. Stealth rocks is mandatory, I need as many entry hazards as possible. Speaking of entry hazards...

Ferrothorn@Rocky Helmet
Iron Barbs
Careful
252 HP / 88 Def / 168 SDef
- Spikes
- Thunder Wave
- Leech Seed
- Power Whip
EVEN MORE PARALYSIS SUPPORT! I seriously can’t stress its importance enough. I can see clerics (Celebi and Chansey being the most prominent) could be a problem. Anyway, Spikes for extra hazards, Leech Seed to force switches, Thunder wave because of my paralysis hard-on, Power Whip for STAB. EVs are for general mixed bulk rather than tailored to survive anything specific, and Rocky Helmet+Iron Barbs=29% damage per physical hit to really rack up the residual damage with the hazards. I don’t want all my hard hazard-setting work going to waste though so...

Gengar@Leftovers
Levitate
Timid
4 HP / 252 SpA / 252 Spe
- Substitute
- Disable
- Shadow Ball
- Focus Blast
Gengar fulfils the spinblocker role on the team, which in addition with subdisable stops most that would harm Gengar in their tracks. Ghost+Fighting give unresisted coverage and hit nice and hard. Immunity to Mach Punch is also very useful. However, the team is incomplete without a physical hitter as special walls cause an impass on both sides when paired with Gengar. The solution...

Terrakion@Choice Scarf
Justified
Jolly
252 Atk / 252 Spe / 4 HP
- Close Combat
- Stone Edge
- Earthquake
- Rock Slide
Terrakion is one of the hardest hitting pokemon in OU, and its scarfed speed is just ridiculous. I know it’s advised not to use Earthquake on Terrakion but it’s great for catching Tentacruel unaware and hits incredibly hard. The rest is standard – Rock Slide over X-Scissor because there are very few pokemon that X-Scissor hurts more than Stone Edge and Rock Slide is both more accurate than SE and has the flinch chance, which is more useful with the widespread paralysis in the team.
So there's the team, please let me know if there are any glaring weaknesses you can think of, anything that you'd recommend replacing, any advice at all. Thanks!