Yoshi vs Kyurem
Well, gentlemen, there is a secret boss on Yoshi's Island.
When Yoshi was in the World 2, near the Mini-Boss room, he found a warp which was high, but thanks to use one of his egg like a little rocket, he reached the secret room.
When Kamek saw him, he sayed:
"Yoshi, this time Mario will come to the castle. Hehehehe. Come on" and he trhew a Pokéball which was containing Kyurem.
"ROAAAAAAR"(Tip. Put Mini-Boss Yoshi's Island music for more fun when you read this ffc)
First, Kyurem jumped very high so Yoshi can't hit him easily and began summoning some ice stalactites;no problem for Yoshi, thanks to his super speed.
Then, Kyurem began to breath very cold, forming icy stairs which Yoshi used it for hit Kyurem:1 time.
Then, he transforms to White Kyurem and began also to use Ice Burn, trapping Yoshi for a moment and then using the icy stairs:2 times.
Now it's Black Kyurem, using thunderbolts and claw hits, but when he used icy stairs this time hit Yoshi with thunderbolt, forcing him to retry and defeating him