While playing Living Towers, you will eventually unlock the Juggle modifier. Use it to lower gravity, which will make juggles easier and allows an easy 10-hit combo when you corner an opponent. Perform a 10-hit combo with all 24 characters in the game (excluding DLC characters) to get the "Knockout" trophy. You can easily perform a 10-hit combo with all characters in Practice mode. Always use X-Ray attacks (can be used infinitely in Practice mode) to get 5-15 hits. With some characters, you will only need to activate the X-Ray attack for it to count as 10+ hits. All required button combinations are shown in the video. Make sure that you are using the same character variation that is shown in the video. For most combos it does not matter, but some special moves are not available with certain character variations.