Please rate my Polytype team

Question

This is the team I used for the Polytype Tourney. It's fared pretty well in regular play; what improvements can be made to make it better?

Swampert @ Leftovers
Ability: Damp
Shiny: Yes
EVs: 252 HP / 4 Def / 252 SpD
Sassy Nature
IVs: 0 Spe
- Stealth Rock
- Flip Turn
- Earthquake
- Toxic

Stealth Rock and Toxic can wear down the opposing team. Earthquake is STAB. Flip Turn with a Sassy Nature and 0 Speed IVs allow Swampert to pivot out safely. Damp makes it the perfect counter to Regieleki, able to block all Electric moves, plus Explosion and Self-Destruct.

Ferrothorn @ Rocky Helmet
Ability: Iron Barbs
EVs: 248 HP / 252 Atk / 8 SpD
Brave Nature
IVs: 0 Spe
- Power Whip
- Knock Off
- Leech Seed
- Gyro Ball

Ferrothorn and Swampert make up my team's defensive core. Ferrothorn can eat Grass attacks meant for Swampert, and Swampert can wall any Fire attacks meant for Ferrothorn. Knock Off gets rid of items, Leech Seed can wear down an opponent greatly, and Power Whip and Gyro Ball are STAB. I'm considering replacing Gyro Ball. If I do, what should it be replaced with? Rocky Helmet and Iron Barbs messes with physical attackers, and Brave and 0 Speed IVs allow Gyro Ball to do maximum damage.

Moltres @ Heavy-Duty Boots
Ability: Flame Body
EVs: 248 HP / 88 Def / 28 SpD / 144 Spe
Bold Nature
IVs: 0 Atk
- Defog
- Mystical Fire
- Roost
- Scorching Sands

My Defogger. Heavy-Duty Boots and Roost allow it to potentially stay in longer, and clear away annoying hazards and screens. I chose Mystical Fire over Flamethrower to help cripple special attackers. Scorching Sands is good coverage, and can be an important asset against physical attackers.

Tapu Koko @ Heavy-Duty Boots
Ability: Electric Surge
Shiny: Yes
EVs: 252 SpA / 4 SpD / 252 Spe
Timid Nature
- Thunderbolt
- Dazzling Gleam
- U-turn
- Roost

STAB Thunderbolt in Terrain does a lot of damage. It and Dazzling Gleam are both STAB, and cover the vast majority of Pokemon. U-turn and Heavy-Duty Boots allow it to keep coming back in, with Roost to help if it ever gets chipped down.

Spectrier @ Leftovers
Ability: Grim Neigh
EVs: 112 HP / 20 Def / 172 SpA / 20 SpD / 184 Spe
Timid Nature
IVs: 0 Atk
- Substitute
- Shadow Ball
- Nasty Plot
- Disable

SubDisable is useful, stopping opponents from setting up. Nasty Plot-boosted Shadow Ball rips through just about anything that doesn't resist it.

Hydreigon @ Lum Berry
Ability: Levitate
Shiny: Yes
EVs: 252 Atk / 4 SpD / 252 Spe
Adamant Nature
- Dragon Dance
- Throat Chop
- Outrage
- Earthquake

I opted for a physical Hydreigon to catch opponents off-guard. Dragon Dance makes Hydreigon far more potent for sweeping. Throat Chop is the best Dark STAB it gets, Outrage is the best Dragon STAB, and Earthquake is coverage. It can shrug off confusion and burns once thanks to the Lum Berry, allowing it to continue sweeping.

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A few of the things I'd like help with:

1. Should I replace Gyro Ball on Ferrothorn? If so, what should I replace it with?
2. I have great difficulty with Ground types. Hippowdon is too physically bulky to be dealt with by Power Whip or Flip Turn, and most players are usually able to get it out of there before I can Toxic it. I really don't have a Landorus-T counter, with my best bet being to pray that it gets burned by Moltres' Flame Body. I can wear it down with Leech Seed and Toxic, but that's shaky as well. Excadrill can be annoying as well, due to its Speed and high Attack. Hell, even Gastrodon gives me trouble, as the only Grass move I have is on Ferrothorn, and no player is keeping Gastrodon in against a Ferrothorn.
3. General improvements to be had.

If it is felt that any Pokemon need to be replaced, it would be preferable if I could keep the Polytype theme, and not have any overlapping types. If it's absolutely necessary, however, then I have no objections.

Pokepaste here

Thanks in advance.

Comments

You should be aware that your opponent can scout your team :P You shouldn't tell polytype tour, just tell OU so that they don't know for what purpose is this team.

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Here are my random suggestions for it

First, don't use shiny Hydreigon, just don't. Also, consider using a + atk - def or - spd nature and use fire blast over outrage. Outrage really sucks atm. You don't want Magearna switching in for free

On Ferrothorn, replace gyro ball with spikes. Trust me, spikes is such a blessing in a tier where Garchomp and Magearna are present. It does the same damage as rocks to Rillaboom, Spectrier and Heatran while dealing more to the previously mentioned two. It also wears down opposing durians much faster than rocks

I'm not a fan of the Moltres ev spread. Like really, using Moltres to outspeed stuff like Excadrill or Landorus Therian is a dumb idea imo. You're better off using Ferrothorn against those two. Personally, I go 248 HP / 236 Def / 24 SpD as the spread to just straight up counter Cinderace

These are just my suggestions. I probably can think of more but it would look like my own team

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@Swastik I'm already eliminated from the tourney. That's why I posted this :P

@Demon Hunter Any particular reason to not use shiny Hydreigon? I wasn't aware it made a difference. Why should I go for mixed Hydreigon with Fire Blast when I can hit Magearna super effectively with Earthquake? I do like the Ferrothorn and Moltres suggestions; thanks!

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Green is not a fitting color on Hydreigon and especially not that shade of green. Buzzwole and Ferrothorn. Muscle bug and durian will give you a lot of grief without fire blast. I highly doubt Hydreigon's outrage will bother muscle bug that much even at + 1

Also, if you like that Moltres suggestion, don't use it to counter something like Ferrothorn or Rillaboom. You're only target should be Cinderace on that set

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Alright, got it. Thanks!