The Troll King totally wiping the floor with Super Sonic. It establishes just how much of a badass the character is.
Luigi gets one when he becomes the first person to successfully harm the Troll King by cutting off his arm. Granted he dies, but being the first character to injure the most powerful being in the series has to count for something.
Rob, Silver, and Elmer holding back an entire legion of trolls. Even Alexis impressed
Chapter 6 is one in general for Silver. Despite being looked down upon by Shadow, Silver proves to be a much more levelheaded and smarter leader than Shadow ever was.
Mario gets a massive one when he nearly defeats the Troll King.