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Disclaimer: The gifs not hidden behind links are part of the fight from the video, while the gifs hidden behind links are those demonstrating other moves in Florinia's arsenal featuring Pokemon that are not Hariyama.
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The reason why Sand Tomb hit is because I used Roost beforehand. Not sure if Rayquaza learns Roost beforehand, but there you go.
Florinia's signature move for two-thirds of her team is Nature Power, which in this terrain becomes Sand Tomb.
It's basically Wrap but Ground-type. Usually it deals deal 1/16 of your max HP at the end of each turn, but in this desert terrain it gets boosted to 1/6 max HP. So that's nice.
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Florinia's Maractus has Needle Arm. In the desert terrain its BP is boosted from 60 to 90 before STAB, and it can flinch.
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It also had Mega Drain in earlier episodes, but Florinia got rid of it for fucking Spikes because actual damaging Grass-type moves aren't hip here in the Onyx Trainer's School.
Most of Florinia's team relies on multiple turns of setup. Unfortunately they are also slow, giving us an opportunity to use Belly Drum to exploit this flaw.
Belly Drum should be useful here when you have something as tanky as Sumomus and access to healing items.
Her team's main source of direct damage is the Bug-type multihit Pin Missile, which gets its 1.5x damage boost from the terrain rather than STAB.
After powering up with a good belly drum, Sumomus is ready to show Florinia who's boss.
Unfortunately, there's not enough desert-based Grass 'mons, so the devs couldn't resist throwing this bastard in.
It only has 1 IV per stat, and it doesn't have Technician to make its priority Mach Punch truly dangerous.
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On the other hand, it has fucking Spore, which means that if you're slower than it, it can put you to sleep before you can do anything.
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For some reason, its other two moves are Mega Drain and Leech Seed, neither of which make use out of its 130 base attack.
Let's push it out of the way for our next subject.
Ferroseed represents Florinia's base strategy. It has the moveset Nature PowerSand Tomb/Sandstorm/Leech Seed/Pin Missile.
It also holds a Big Root to regain extra HP from Leech Seed as well as Iron Barbs to deal damage on contact.
Compared to the PULSE Tangrowth from before, it's nothing. The devs have other plans in mind for us here.
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Cacnea's strategy is to make itself hard to hit. Your accuracy is cut by 1/5 at the start since the Desert Terrain activates its Sand Veil ability by default. Its terrain-boosted Sand Attack makes things worse.
It has Pin Missile instead of Needle Arm, despite the latter being boosted by the terrain in addition to its STAB.
It we KO it first thing, though, it doesn't have the chance to blind your Pokemon.
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Cottonee can Protect itself for a turn while you get buffeted by any lingering residual damage.
More importantly, it has Prankster, because of course it does. Not sure if the AI and/or devs know this, but Nature Power gets priority from Prankster, which means Cottonee can use Sand Tomb with priority.
Well it didn't use it, and it pays the price. Fortunately it used Leech Seed, which will never proc since Florinia will not have a 'mon alive at the end of the remaining turns.
Finally, here's this giant turd.
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Here's the problem with this stupid plant. Unlike the rest of her team which focuses on residual damage, this one relies on being unkillable via Stockpile's defense increases and Recover.
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Its only connection to the Desert terrain is its Sandstorm weather move. The Desert terrain does affect the Sandstorm weather effect... by making it last 8 turns instead of 5. 
Unlike Julia's Electrode, we have a hard counter in the form of those Fighting-type Pokemon from the slums as well as the X Attack items from the department store, so we can outdamage its defenses even without Belly Drum.
You could poison it with a double dose of Toxic Spikes from Trubbish, which will give it the Toxic variety of poison that will eventually overcome its healing shenanigans before it can survive your assault.
But that's boring. Let's oneshot it instead like everything else.
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Not only that, let's pull a mulligan and have somebody else in on the fun.
In this scenario, Sumomus was left with so little health that it being poisoned was enough to be KO'd before it could finish the job.
This time, though, we have backup.
Meet our next challenger, Krystal Ken.
How did I get this majestic creature? Well, do I have a tale for you. It's yet another Ground-type Pokemon that is obtainable in the Peridot area right after beating the Electric-type gym.
Cradily's offense is severely lacking. Its only directly damaging move is the weak Rock-type 50 BP Smack Down.
Ame suggests using Sand Attack against Florinia, and it can be used here in conjunction with Numel, Onix, or a Kling from the Obsidia side of the underground railnet to withstand Cradily's rocks until it runs out of PP for them, at which point it's completely unable to damage you.
Unfortunately, the strategy of "Spam Curse 6 times and atttempt to oneshot it with Gyro Ball" isn't much better.
It also fails to oneshot it, even with the boost from the Steel Gem found hiding somewhere in Obsidia.
I think killing those bats and that speed-boosting nature were a bad idea.
Oh well, we manage to kill it next turn despite Florinia's attempt to delay the inevitable.
