Double Pain

Double Pain is a full playthrough challenge run of Paper Mario: The Thousand-Year Door. In this challenge the player plays through the game with Double Pain equipped. That's all.
This challenge is mostly used as an add-on in other challenges to increase difficulty.

TTYD (Full Game)	TTYD (Pit)
Difficulty: Diamond Execution Rating: 1.8 Strategy Rating: 2	Difficulty: Emerald Execution Rating: 2.5 Strategy Rating: 2

Rules

Buy and equip Double Pain as soon as it's available.

Completions

Paper Mario: The Thousand-Year Door (GCN)

Player	Game Completion	Pit Completion	Challenge Completion Link
Dani Doyle	✓
Dark Koopatrol	✓	✓
Dyla	✓	✓
Jayjar	✓	✓
Olmi	✓	✓
PerpluxusJam	✓	✓
Stebbdogg	✓	✓
TenderMeat	✓	✓	Link, Pit

Paper Mario: The Thousand-Year Door (Switch)

Player	Game Completion	All Bosses	Pit Completion	Challenge Completion Link
Kappy	✓	✓	✓	Link

Tips & Tricks

Double Pain is available from Charlieton, who only appears after defeating Hooktail. His stock rerolls after you go two screens away, so you can go to the Sewers or the train tracks and come back to check his stock if he doesn't have Double Pain when you first check.
The Damage Dodge and Defend Plus Badges actually decrease the damage dealt before Double Pain applies, so they gain some extra utility in this challenge.