I know everyone knows about Bomb Hovers, but I found a very reliable way to pause buffer one. Obviously, this is only useful if you don't have a wall or the Hover Boots. This works the same way for both Child and Adult Link.
1. Stand completely still and pull out a bomb and wait until it turns red the
7th time. This includes the time right before the bomb starts blinking faster.
2. Advance frames until the bomb turns blue.
3. On the blue frame, hold R and down on the control stick.
4. Advance more frames until the bomb is at Link's feet. It should be red by this time (big and blue as Adult Link).
5. Backflip.
VideoNote that this one a frame of leeway
sometimes. If you accidentally waited until the bomb was a frame below Link's feet and backflipped, it may work, but in some cases you'll get hurt by the explosion. Also, if you accidentally went to the 2nd frame the bomb was blue, wait until the bomb is one frame above Link's feet and backflip; it just might work.
I know other methods of hovering (sideflip bombchus, etc) are quicker, but this one has served me the best in many challenge runs, and I really don't like bombchu bowling.
EDIT: I'd also like some help on the gainer. Link always goes backwards even when I perform a backflip that isn't in Z-Target mode.