Kit's Shockwave Launcher is a Mythic explosive weapon in Battle Royale, it uses Rockets. It does not deal damage to other players, though. It is found by eliminating Kit and drops with Kit's Charge Shotgun and the Catty Corner Keycard.
Kit's Shockwave Launcher works like a Shockwave Grenade, it flings players and does not cause fall damage. It is very useful to break into opponents' builds and also to gain height advantage.
This item can be considered a Rocket Jump.
Kit's Shockwave Launcher was vaulted with Patch 14.00 at the beggining of Chapter 2 Season 4. However, Kit's Shockwave Launcher remains available on iOS and macOS devices as those devices are stuck on Patch 13.40. It also remains available in Unvaulted.