From the Super Mario Wiki
Dashell is one of the Pixls in the game Super Paper Mario. He gives the team a great boost in speed, and his name itself comes from the word "dash". He is unlocked after defeating Wracktail in the Flipside Pit of 100 Trials, and his Catch Card is found on the tenth floor of the Flopside Pit of 100 Trials. Dashell thinks fighting is useless and revealed that when he gets in a fight, he flees. According to his tattle, Dashell believes that "Life is a sprint, not a marathon". When he causes his user to dash, he flashes red.
Dashell, like Barry and Piccolo, is an optional Pixl, and is not required to beat the game. If the player beats the Flipside Pit of 100 Trials and gets Dashell, while Peach and Francis are on the Swoon.exe, Dashell is not listed in the Pixl section.
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