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 then pick both up at once. Next, throw them both up at the block containing Yoshi. You'll notice Yoshi will emerge quicker than usual. Take Yoshi to the brown blocks below and leave him there. Go back up and jump on the block that Yoshi came out of. You'll hear Yoshi's "zip-zoo" sound effect as if you mounted him, but you'll be walking around like normal. Hit the blue P-Switch to turn the blocks into coins, and Yoshi will fall down the pit. The second Yoshi will appear where Mario is standing!