You won't find this in any videos, but if you have the rock in Kirby's Adventure if you press the button enough you can fly with it, it does immense damage to bosses if you can pull it off. And in Kirby triple Deluxe tap the button at the right moment while in heavy rock form in the air and do the same thing, it is especially helpful in the true arena since it can hit the bosses while in the air. Me and my friends call it the rock rise

I'm trying to get a better score on the true arena (yes I beat it but it was hard.) hope fully the rock rise can beat all bosses in record time. another trick is losing your ability on purpose to eat a star and spit it back at a boss, then grabbing your ability as fast as you can, there is more to come.