Blaziken @ Life Orb
Ability: Speed Boost
EVs: 252 Atk/4 SpD/252 Spe
Adamant Nature
Tera-Type: Fire/Fighting
- Flare Blitz
- Close Combat
- Swords Dance
- Agility
Let's face it, Protect is one of the most predictable moves in all of competitive Pokemon. It's especially the case for Blaziken, as its Speed Boost ability allows it to outspeed most Pokemon next turn and safely secure a KO. However, Iron Boulder's signature move, Mighty Cleave, is specifically designed to break
through Protect, giving Boulder a clean 2HKO against Blaze.
252 Atk Iron Boulder Mighty Cleave vs. 0 HP / 0 Def Blaziken: 196-232 (65.1 - 77%) -- guaranteed 2HKO
Of course, that's not the only option. In truth, it's Boulder's riskiest, as chances are, it had switched straight into an SD on Blaze's end. And it won't appreciate taking a CC that it doesn't have to, as even without a boost or an offensive item, CC still hurts
252+ Atk Blaziken Close Combat vs. 0 HP / 4 Def Iron Boulder: 244-288 (76 - 89.7%) -- guaranteed 2HKO
But it can OHKO first. Zen Headbutt OHKOes cleanly, but comes at the risk of missing. Whereas EQ has hazards or Tera-Ground to help secure the KO, and even if it low-rolls, Blaze can finish itself off if it had a Life Orb on at the time
252 Atk Tera Ground Iron Boulder Zen Headbutt vs. 0 HP / 0 Def Blaziken: 332-392 (110.2 - 130.2%) -- guaranteed OHKO
252 Atk Iron Boulder Earthquake vs. 0 HP / 0 Def Blaziken: 276-326 (91.6 - 108.3%) -- 50% chance to OHKO/guaranteed OHKO after Stealth Rock/1 layer of Spikes
252 Atk Tera Ground Iron Boulder Earthquake vs. 0 HP / 0 Def Blaziken: 414-488 (137.5 - 162.1%) -- guaranteed OHKO
All that is possible because Booster Energy Boulder can outspeed Blaze at +2. Even a Jolly Blaze gets outsped by 3 points, and it only takes 1 to go first.
...
Clicking Agility on the switch changes things, however. With it, Blaze ultimately ends the turn at +3, giving Boulder an ultimatum. Either it switches back out, making the Booster Energy go to waste, or faces a very real threat of being destroyed by Life Orb CC
252+ Atk Life Orb Blaziken Close Combat vs. 0 HP / 4 Def Iron Boulder: 317-374 (98.7 - 116.5%) -- 93.8% chance to OHKO
As you can see, unfortunately Boulder
does have a chance to survive, as miniscule as it is. But since that involves getting the absolute lowest roll in all of low rolls, I'd consider it worthy as a pass. After all, hazards can fix that easily, and we can reasonably expect it to take damage from them because we prepared for Booster Energy specifically.
Tera-Fire is the Tera-Type of choice, as physical attacks really don't want to be burned, but Tera-Fighting can be ran if you want to protect yourself against Kingambit's Sucker Punch, or have a real good reason to boost CC over Flare Blitz.