A Game-changing Move is the 133rd episode of the Katekyo Hitman Reborn! anime.
Genkishi engages Tsuna in battle using his hell ring, an armour and a special sword. Tsuna is at a disadvantage as he does not have much energy left due to firing the X-Burner a few times before. However, Genkishi wavers when Tsuna's resolute eyes reminds him of Uni. Tsuna then sets up a plan to absorb Genkishi's Flames, and he regains his energy. Tsuna gains the upper hand and manages to overpower Genkishi.