Check: Wo-Chien

Anton Chizzurh (Wo-Chien) @ Leftovers
Ability: Tablets of Ruin
Tera Type: Fairy
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Giga Drain
- Foul Play
- Protect
- Leech Seed
With full PhysDef, given a free turn to switch in a Wo-Chien can 1v1 Scale Shot Garchomp with Foul Play to take advantage of its boosted attack stat and Leech Seed to remain healthy. Even at +2 and with Tera Fire, Fire Fang and even a 5 hit Scale Shot does not come close to killing, while Foul Play at +2 is enough to kill Chomp after a round of Leech Seed chip. If Chomp doesn't SD, Leech Seed recovery means that Scale Shot at 5 hits is only a 5HKO, with Protect making that an unwinnable matchup and Foul Play still being a clean 2HKO with Leech Seed (the recovery helping to offset Rough Skin chip). Wo-Chien is a check, lacking reliable recovery and taking hazards, but is able to easily 1v1 Chomp. Tera Fairy is a good panic option to drop the Fire Fang weakness and gain an immunity to Scale Shot, but should not be necessary in this matchup.
Counter: Levitate Weezing-Galar

Andre 2 Stacks (Weezing-Galar) @ Leftovers
Ability: Levitate
Tera Type: Water
EVs: 248 HP / 252 Def / 4 SpD / 4 Spe
Bold Nature
IVs: 0 Atk
- Strange Steam
- Clear Smog
- Toxic
- Pain Split
With Levitate, Weezing-Galar is immune to both of Garchomp's STAB options and can only be hit by its 65BP Fire Fang, which is a 10HKO after Leftovers recovery and a 6HKO even with Tera Fire; This allows Weezing to sit on it and clear away any boosts with Clear Smog while using Pain Split to remain healthy. Although a typical Weezing-G will run more speed for Kingambit and therefore will not have as much bulk, this set uses Toxic to take down Garchomp and other mons that it can sit on which do not fear burn and so is invested fully in defence. Without Tera Fire available Garchomp gets 2HKOd by Strange Steam, and even with Tera Fire, Toxic will take Chomp down while Weezing-G can Clear Smog away its boosts and Pain Split off damage taken as at +2 it is still impossible for Garchomp to 2HKO Weezing-G.
This means that you can switch in hard on an SD, Clear Smog as they attack and Toxic on their SD to put them on a permanent timer before healing back up with Pain Split as their next attack won't kill you, Garchomp's high HP stat (357 as opposed to Weezing-G only hitting 343) notably taking you out of range of another Fire Fang so that you can Clear Smog again. Tera Water is not good in general for this matchup as you lose your immunity to Scale Shot, but can be used in a pinch to save Weezing-G from Fire Fang vs a low health, Toxic'd Garchomp that will die on the next turn. Leftovers can be ran due to the Spikes immunity provided by Levitate.

Anton Chizzurh (Wo-Chien) @ Leftovers
Ability: Tablets of Ruin
Tera Type: Fairy
EVs: 252 HP / 252 Def / 4 SpD
Bold Nature
IVs: 0 Atk
- Giga Drain
- Foul Play
- Protect
- Leech Seed
With full PhysDef, given a free turn to switch in a Wo-Chien can 1v1 Scale Shot Garchomp with Foul Play to take advantage of its boosted attack stat and Leech Seed to remain healthy. Even at +2 and with Tera Fire, Fire Fang and even a 5 hit Scale Shot does not come close to killing, while Foul Play at +2 is enough to kill Chomp after a round of Leech Seed chip. If Chomp doesn't SD, Leech Seed recovery means that Scale Shot at 5 hits is only a 5HKO, with Protect making that an unwinnable matchup and Foul Play still being a clean 2HKO with Leech Seed (the recovery helping to offset Rough Skin chip). Wo-Chien is a check, lacking reliable recovery and taking hazards, but is able to easily 1v1 Chomp. Tera Fairy is a good panic option to drop the Fire Fang weakness and gain an immunity to Scale Shot, but should not be necessary in this matchup.
252 Atk Wo-Chien Foul Play vs. 0 HP / 0 Def Garchomp: 162-192 (45.3 - 53.7%) -- guaranteed 2HKO after Leech Seed damage
+2 252 Atk Wo-Chien Foul Play vs. 0 HP / 0 Def Garchomp: 324-382 (90.7 - 107%) -- 43.8% chance to OHKO
After getting Leech Seed up, Wo-Chien can 2HKO Garchomp with Foul Play or kill it after Leech Seed damage if Chomp opts to SD on the Leech Seed turn.
+2 252 Atk Wo-Chien Foul Play vs. 0 HP / 0 Def Garchomp: 324-382 (90.7 - 107%) -- 43.8% chance to OHKO
After getting Leech Seed up, Wo-Chien can 2HKO Garchomp with Foul Play or kill it after Leech Seed damage if Chomp opts to SD on the Leech Seed turn.
252 Atk Garchomp Scale Shot (5 hits) vs. 252 HP / 252+ Def Tablets of Ruin Wo-Chien: 120-140 (32 - 37.4%) -- approx. possible 5HKO after Leftovers recovery and Leech Seed recovery
252 Atk Tera Fire Garchomp Fire Fang vs. 252 HP / 252+ Def Tablets of Ruin Wo-Chien: 116-138 (31 - 36.8%) -- possible 5HKO after Leftovers recovery and Leech Seed recovery
Even with 5 hits from Scale Shot or Tera Fire on Fire Fang, Leech Seed makes Chomp only able to 5HKO Wo-Chien with unboosted hits.
+2 252 Atk Garchomp Scale Shot (5 hits) vs. 252 HP / 252+ Def Tablets of Ruin Wo-Chien: 225-270 (60.1 - 72.1%) -- approx. 2HKO after Leftovers recovery and Leech Seed recovery
+2 252 Atk Tera Fire Garchomp Fire Fang vs. 252 HP / 252+ Def Tablets of Ruin Wo-Chien: 230-272 (61.4 - 72.7%) -- guaranteed 2HKO after Leftovers recovery and Leech Seed recovery
After an SD, Chomp can 2HKO Wo-Chien with Tera Fang or 5 hit Scale, but will die to Foul Play after Leech Seed damage.
252 Atk Tera Fire Garchomp Fire Fang vs. 252 HP / 252+ Def Tablets of Ruin Wo-Chien: 116-138 (31 - 36.8%) -- possible 5HKO after Leftovers recovery and Leech Seed recovery
Even with 5 hits from Scale Shot or Tera Fire on Fire Fang, Leech Seed makes Chomp only able to 5HKO Wo-Chien with unboosted hits.
+2 252 Atk Garchomp Scale Shot (5 hits) vs. 252 HP / 252+ Def Tablets of Ruin Wo-Chien: 225-270 (60.1 - 72.1%) -- approx. 2HKO after Leftovers recovery and Leech Seed recovery
+2 252 Atk Tera Fire Garchomp Fire Fang vs. 252 HP / 252+ Def Tablets of Ruin Wo-Chien: 230-272 (61.4 - 72.7%) -- guaranteed 2HKO after Leftovers recovery and Leech Seed recovery
After an SD, Chomp can 2HKO Wo-Chien with Tera Fang or 5 hit Scale, but will die to Foul Play after Leech Seed damage.
Counter: Levitate Weezing-Galar

Andre 2 Stacks (Weezing-Galar) @ Leftovers
Ability: Levitate
Tera Type: Water
EVs: 248 HP / 252 Def / 4 SpD / 4 Spe
Bold Nature
IVs: 0 Atk
- Strange Steam
- Clear Smog
- Toxic
- Pain Split
With Levitate, Weezing-Galar is immune to both of Garchomp's STAB options and can only be hit by its 65BP Fire Fang, which is a 10HKO after Leftovers recovery and a 6HKO even with Tera Fire; This allows Weezing to sit on it and clear away any boosts with Clear Smog while using Pain Split to remain healthy. Although a typical Weezing-G will run more speed for Kingambit and therefore will not have as much bulk, this set uses Toxic to take down Garchomp and other mons that it can sit on which do not fear burn and so is invested fully in defence. Without Tera Fire available Garchomp gets 2HKOd by Strange Steam, and even with Tera Fire, Toxic will take Chomp down while Weezing-G can Clear Smog away its boosts and Pain Split off damage taken as at +2 it is still impossible for Garchomp to 2HKO Weezing-G.
This means that you can switch in hard on an SD, Clear Smog as they attack and Toxic on their SD to put them on a permanent timer before healing back up with Pain Split as their next attack won't kill you, Garchomp's high HP stat (357 as opposed to Weezing-G only hitting 343) notably taking you out of range of another Fire Fang so that you can Clear Smog again. Tera Water is not good in general for this matchup as you lose your immunity to Scale Shot, but can be used in a pinch to save Weezing-G from Fire Fang vs a low health, Toxic'd Garchomp that will die on the next turn. Leftovers can be ran due to the Spikes immunity provided by Levitate.
0 SpA Weezing-Galar Strange Steam vs. 0 HP / 4 SpD Garchomp: 194-230 (54.3 - 64.4%) -- guaranteed 2HKO
0 SpA Weezing-Galar Clear Smog vs. 0 HP / 4 SpD Tera Fire Garchomp: 54-64 (15.1 - 17.9%) -- possible 6HKO
Strange Steam 2HKOs Garchomp without Tera before even a +2 Chomp can kill Weezing-G, while if they have Tera Fire available it's better to Toxic them and then deal small amounts of damage with Clear Smog as Toxic and Pain Split wears them down.
0 SpA Weezing-Galar Clear Smog vs. 0 HP / 4 SpD Tera Fire Garchomp: 54-64 (15.1 - 17.9%) -- possible 6HKO
Strange Steam 2HKOs Garchomp without Tera before even a +2 Chomp can kill Weezing-G, while if they have Tera Fire available it's better to Toxic them and then deal small amounts of damage with Clear Smog as Toxic and Pain Split wears them down.
Without Garchomp Tera:
252 Atk Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 45-54 (13.5 - 16.2%) -- possibly the worst move ever
+2 252 Atk Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 90-107 (27 - 32.1%) -- 56% chance to 4HKO after Leftovers recovery
Without Tera Fire, Garchomp can never break through Weezing-G, doing minimal damage with Fire Fang even after a boost.
With Garchomp Tera:
252 Atk Tera Fire Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 67-81 (20.1 - 24.3%) -- possible 6HKO after Leftovers recovery
+2 252 Atk Tera Fire Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 135-160 (40.5 - 48%) -- guaranteed 3HKO after Leftovers recovery
Tera Fire lets Chomp at least chunk Weezing-G; however, even +2 Tera Fire Garchomp does 41.9% after Leftovers and so Weezing can Clear Smog its boosts away and Pain Split on it freely, and although Weezing-Galar will come out of it low it'll still win the exchange with Toxic and Pain Split chip.
252 Atk Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 45-54 (13.5 - 16.2%) -- possibly the worst move ever
+2 252 Atk Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 90-107 (27 - 32.1%) -- 56% chance to 4HKO after Leftovers recovery
Without Tera Fire, Garchomp can never break through Weezing-G, doing minimal damage with Fire Fang even after a boost.
With Garchomp Tera:
252 Atk Tera Fire Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 67-81 (20.1 - 24.3%) -- possible 6HKO after Leftovers recovery
+2 252 Atk Tera Fire Garchomp Fire Fang vs. 248 HP / 252+ Def Weezing-Galar: 135-160 (40.5 - 48%) -- guaranteed 3HKO after Leftovers recovery
Tera Fire lets Chomp at least chunk Weezing-G; however, even +2 Tera Fire Garchomp does 41.9% after Leftovers and so Weezing can Clear Smog its boosts away and Pain Split on it freely, and although Weezing-Galar will come out of it low it'll still win the exchange with Toxic and Pain Split chip.
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