Captain Falcon (SSBU)/Forward aerial
Captain Falcon performs his notorious Knee Smash. While the sweetspot only lasts one frame, it's immensely powerful when it hits. Because of its sheer power, it deals high shield damage, makes a great edgeguarding tool, combo finisher, and punishes airdodges if the player reads it correctly or whiffed aerial moves. Even the sourspot has a purpose in edgeguards as a poking tool on aerial opponents in the middle of recovering. Outside of its one frame sweetspot, the move has other problems in its decently high landing lag.