idk if this is common knowledge but I have never seen another diddy kong do this
1. start rocketbarrel boost (must be on the ground)
2. tilt all the way to one side
3. release (charge only matters for distance)
4. tilt the opposite way Diddy is flying to explode
kills at high percents! Although it hurts you. You can also do an uncharged up B and ram it into the ground on either side of you to make it explode. It doesn't always explode using this method, though.
1. start rocketbarrel boost (must be on the ground)
2. tilt all the way to one side
3. release (charge only matters for distance)
4. tilt the opposite way Diddy is flying to explode
kills at high percents! Although it hurts you. You can also do an uncharged up B and ram it into the ground on either side of you to make it explode. It doesn't always explode using this method, though.