Best lead
Lead: Miraidon + Iron Hands
Electric Terrain immediately blocks Vivillon’s Sleep Powder.
Iron Hands threatens Fake Out on Sableye or Maushold.
Miraidon threatens huge spread damage with Electro Drift/Discharge depending on the set.
Backline: Chi‑Yu + Urshifu
Chi‑Yu breaks defensive pivots.
Urshifu cleans up weakened targets and pressures Blastoise hard.
Turn-by-turn plan
If they lead Vivillon + support (Sableye or Maushold)
This is the most likely anti-meta lead.
Your action
Why
Fake Out Vivillon with Iron Hands
Prevents Tailwind or immediate pressure.
Electro Drift/Draco Meteor into Vivillon with Miraidon
Remove it before it can contribute.
i mean floette charizard y basculeigon whimsicott kingambit garchomp
If you're talking about the Japanese Nationals-winning Regulation M team built around:
Floette-Eternal Flower
Charizard (Mega Y)
Basculegion
Whimsicott
Kingambit
Garchomp
against:
Sylveon
Orthworm
Mega Blastoise
Maushold
Vivillon
Sableye
then I'd generally like this matchup for the Nationals team.
What they're trying to do
Their team is mostly support/disruption:
Vivillon → Sleep Powder/Tailwind
Sableye → Fake Out/Wisp/Encore shenanigans
Maushold → Follow Me/Friend Guard
Orthworm → Shed Tail or Body Press
Sylveon + Mega Blastoise are the actual damage dealers
The biggest threat is losing momentum to sleep + redirection.
What I'd bring
Lead
Charizard Y
Whimsicott
Back
Kingambit
Basculegion
Leave Floette and Garchomp home unless you see something unusual in team preview.
Why Charizard + Whimsicott?
Sun weakens Mega Blastoise's Water attacks.
Tailwind gives immediate speed control.
Charizard threatens huge spread damage into Vivillon, Maushold, and Sableye.
Vivillon hates sun because Sleep Powder becomes much less reliable if you can KO it immediately.
If they lead Vivillon
Turn 1 is often:
Tailwind with Whimsicott
Heat Wave with Charizard
You care much more about removing Vivillon than making a fancy prediction.
If they lead Maushold + Sylveon
Usually:
Tailwind
Heat Wave
You're chipping both while setting speed control. After that, bring in Kingambit to pressure Sylveon.
If Mega Blastoise comes out
Protect Charizard if needed and pivot into Basculegion.
Basculegion is often your best late-game cleaner because:
It pressures Blastoise.
It doesn't care much about burns if it's special.
It can capitalize once support Pokémon are weakened.
Kingambit's role
Kingambit is probably the MVP in this matchup.
It:
Resists Sylveon's Fairy attacks better than most of your team.
Punishes Sableye.
Cleans late game after Tailwind turns.
Forces awkward positioning from Orthworm.
Biggest mistake to avoid
Don't spend turns trying to set up while:
Vivillon is alive.
Maushold is redirecting.
Sableye is disrupting.
This matchup is won by immediately KOing the support pieces, then letting Charizard and Kingambit overwhelm Sylveon and Blastoise.
If you tell me the exact movesets/EVs of your Nationals team version (there are several variants floating around), I can give a much more precise lead and turn-by-turn plan.
sableye has rain dance
That changes the matchup quite a bit.
Rain Dance Sableye's entire job is to neutralize Mega Charizard Y. If you lead Charizard + Whimsicott and blindly click Tailwind + Heat Wave, Sableye can:
Rain Dance (+1 priority)
Cut Heat Wave damage in half
Enable Mega Blastoise immediately
So I'd be much more cautious about bringing Charizard as the centerpiece.
What I'd bring instead
Lead: Whimsicott + Kingambit
Back:
Charizard Y
Basculegion
This lead is safer into every likely opening:
Sableye + Blastoise
Sableye + Vivillon
Maushold + Sylveon
Orthworm + support
Into Sableye + Blastoise
Turn 1 I'd strongly consider:
Tailwind (Whimsicott)
Attack Blastoise with Kingambit
Most Sableye players will Rain Dance immediately because they're terrified of Charizard in the back.
If they Rain Dance while Charizard isn't even on the field, you've effectively forced them into a defensive turn.
Preserve Charizard
Instead of leading it, use Charizard as a midgame weather reset.
If Sableye sets rain early:
Trade pieces.
Force Sableye to take damage.
Bring Charizard in later.
Now Drought activates after Rain Dance and reclaims weather control.
Biggest target priorities
Vivillon
Sableye
Mega Blastoise
Sylveon
Maushold
Orthworm
The game gets dramatically easier once Sableye is gone because:
Rain can't be re-established.
Charizard becomes much harder to answer.
Basculegion doesn't have to worry about boosted Water attacks.
One thing to watch
If the opponent leads Sableye + Vivillon, don't get baited into focusing Sableye immediately.
Vivillon is usually the piece that steals games through Sleep Powder and speed control. Remove or heavily pressure Vivillon first, then deal with Sableye.
Against a Rain Dance Sableye team, I would generally view Kingambit as the win condition early and Charizard as the win condition late. Let Kingambit absorb the disruption, then bring Charizard in once weather control is favorable.