https://www.gameinformer.com/2018/11/01/yoshi-can-ride-a-yoshi-and-then-those-yoshis-can-ride-poochy-in-yoshis-crafted-world

After Nintendo’s Super Smash Bros. Ultimate Direct, the live stream continued with gameplay of Pokémon: Let’s Go Pikachu and Eevee and Yoshi’s Crafted World. During the Yoshi’s Crafted World gameplay, Nintendo showed a new mechanic where a Yoshi can ride another Yoshi in co-op, and then those Yoshi’s can ride Poochy. It’s insanity. You can see it in the screenshot above.