In Episode 34 of her blind Paper Mario LP, she goes to fight Anti-Guy. She's freaking out about him, because despite keeping herself sequestered from spoilers, she knows he's tough and is terrified of him. She beats him without taking any damage.
Also from this LP, her Audino Snuggltits manages to take down Ghetsis' Hydreigon despite being 6 levels lower and having a moveset without many strong attacks. While the battle was a defeat overall, its performance really stood out as a victory. Lucahjin even comments that no one can ever make fun of her or her Audino ever again because of how well it performed.
Also a meta one for her fans for managing not to spoil the ending of the game and the identity of the Final Boss, meaning Lucah has a genuinely shocked and impressed reaction to the concept.
In episode 26 her Ocarina of Time LP she beat Phantom Ganon without taking any damage.
Then in episode 41 she easily beats Morpha after working out the trick to it, as well as going through the gauntlet to the boss door without much difficulty (much to guest commentator LiamSixx's annoyance).