Electromasterpiece
In Hanenbow, set the cannon leaf to 67 degrees, the top-left leaf to 123 degrees, and you get a flower in like 30 seconds. Note that this cheat may only work with the Japanese version of the game.
Unlock Hanenbow Electromasterpiece
On the second stage of Hanenbow set your launch leaf to 118 degrees, leave the top leaf at 90 degrees, move the top right leaf to 40 degrees, the middle right leaf to 43 degrees, the bottom right leaf to 42 degrees, the top left leaf to 138 degrees, and the bottom left leaf to 144 degrees, then press D-PAD Right until you are at max speed. You cause a flower to bloom in moments.