In Chocolate Island 5, start off as Caped Mario without Yoshi. Fly up from the beginning of the stage, grab the Gray P-Switch, and put it down on top of the blue P-Switch. If you place it in the right spot you can pick up both switches at the same time. Next, throw them both up at the block containing Yoshi—you'll notice Yoshi will hatch quicker than usual. Doing this will actually create two Yoshis, but you can only see one at a time. Leave Yoshi on the brown blocks below and hit the blue P-Switch to turn the blocks into coins. When that Yoshi falls down the pit, the second Yoshi will appear where it hatched.

If you're riding the invisible Yoshi when the first Yoshi falls down the pit, the second Yoshi will appear where Mario is standing. To set this up, after you leave the first Yoshi on the brown blocks above the pit, go back up and jump on the block that Yoshi hatched from. You should hear the "zip-zoo" sound effect as if you mounted Yoshi, but you'll still be walking around normally. Then, hit the blue P-Switch to make the visible Yoshi fall down the pit, and you'll suddenly be riding the other Yoshi. Try not to be on the ground when this happens, because you'll fall through it and lose a life.