Check
Blastoise @ Weakness Policy
Ability: Torrent
Tera Type: Dark
EVs: 204 HP / 252 SpA / 52 Spe
Modest Nature
IVs: 0 Atk
- Surf
- Protect
- Mirror Coat
- Shell Smash
First use Protect to see what Iron Bundle is going to do. If it uses U-turn, tera and then Shell Smash; after Shell Smash and Weakness Policy, you can probably outspeed and OHKO whatever it switches to, and you can definitely outspeed and OHKO Iron Bundle if it comes in again. If it uses anything but U-turn, tera and Mirror Coat; no matter which of its other attacks it clicks, you will survive and OHKO it.
0- Atk Iron Bundle U-turn vs. 204 HP / 0 Def Tera Dark Blastoise: 76-90 (21.7 - 25.7%) -- 1% chance to 4HKO
252 SpA Choice Specs Iron Bundle Freeze-Dry vs. 204 HP / 0 SpD Tera Dark Blastoise: 160-189 (45.7 - 54%) -- 43% chance to 2HKO
252 SpA Choice Specs Tera Ice Iron Bundle Ice Beam vs. 204 HP / 0 SpD Tera Dark Blastoise: 272-322 (77.7 - 92%) -- guaranteed 2HKO
+4 252+ SpA Tera Dark Blastoise Surf vs. 0 HP / 4 SpD Iron Bundle: 272-321 (107.5 - 126.8%) -- guaranteed OHKO
Counter
Lapras @ Choice Band
Ability: Water Absorb
Tera Type: Fighting
EVs: 52 HP / 204 Atk / 252 SpD
Sassy Nature
- Tera Blast
Switch in, tera, and use Tera Blast. Iron Bundle can't 2HKO you (Ice Beam can do over 50% after you tera, but the first hit before you tera does very little), and Tera Blast OHKOs.
252 SpA Choice Specs Tera Ice Iron Bundle Freeze-Dry vs. 52 HP / 252+ SpD Tera Fighting Lapras: 166-196 (40 - 47.3%) -- guaranteed 3HKO
252 SpA Choice Specs Tera Ice Iron Bundle Ice Beam vs. 52 HP / 252+ SpD Tera Fighting Lapras: 214-252 (51.6 - 60.8%) -- guaranteed 2HKO
252 SpA Choice Specs Tera Ice Iron Bundle Ice Beam vs. 52 HP / 252+ SpD Lapras: 53-63 (12.8 - 15.2%) -- possible 7HKO
204 Atk Choice Band Tera Fighting Lapras Tera Blast (80 BP) vs. 0 HP / 0 Def Tera Ice Iron Bundle: 254-300 (100.3 - 118.5%) -- guaranteed OHKO
Blastoise @ Weakness Policy
Ability: Torrent
Tera Type: Dark
EVs: 204 HP / 252 SpA / 52 Spe
Modest Nature
IVs: 0 Atk
- Surf
- Protect
- Mirror Coat
- Shell Smash
First use Protect to see what Iron Bundle is going to do. If it uses U-turn, tera and then Shell Smash; after Shell Smash and Weakness Policy, you can probably outspeed and OHKO whatever it switches to, and you can definitely outspeed and OHKO Iron Bundle if it comes in again. If it uses anything but U-turn, tera and Mirror Coat; no matter which of its other attacks it clicks, you will survive and OHKO it.
0- Atk Iron Bundle U-turn vs. 204 HP / 0 Def Tera Dark Blastoise: 76-90 (21.7 - 25.7%) -- 1% chance to 4HKO
252 SpA Choice Specs Iron Bundle Freeze-Dry vs. 204 HP / 0 SpD Tera Dark Blastoise: 160-189 (45.7 - 54%) -- 43% chance to 2HKO
252 SpA Choice Specs Tera Ice Iron Bundle Ice Beam vs. 204 HP / 0 SpD Tera Dark Blastoise: 272-322 (77.7 - 92%) -- guaranteed 2HKO
+4 252+ SpA Tera Dark Blastoise Surf vs. 0 HP / 4 SpD Iron Bundle: 272-321 (107.5 - 126.8%) -- guaranteed OHKO
Counter
Lapras @ Choice Band
Ability: Water Absorb
Tera Type: Fighting
EVs: 52 HP / 204 Atk / 252 SpD
Sassy Nature
- Tera Blast
Switch in, tera, and use Tera Blast. Iron Bundle can't 2HKO you (Ice Beam can do over 50% after you tera, but the first hit before you tera does very little), and Tera Blast OHKOs.
252 SpA Choice Specs Tera Ice Iron Bundle Freeze-Dry vs. 52 HP / 252+ SpD Tera Fighting Lapras: 166-196 (40 - 47.3%) -- guaranteed 3HKO
252 SpA Choice Specs Tera Ice Iron Bundle Ice Beam vs. 52 HP / 252+ SpD Tera Fighting Lapras: 214-252 (51.6 - 60.8%) -- guaranteed 2HKO
252 SpA Choice Specs Tera Ice Iron Bundle Ice Beam vs. 52 HP / 252+ SpD Lapras: 53-63 (12.8 - 15.2%) -- possible 7HKO
204 Atk Choice Band Tera Fighting Lapras Tera Blast (80 BP) vs. 0 HP / 0 Def Tera Ice Iron Bundle: 254-300 (100.3 - 118.5%) -- guaranteed OHKO