Great you asked this.
Although this is definitely an uphill battle with characters that totally out-prioritize you like Snake, Wolf, Pit, Pikachu, and Marth you do have some options.
-Reverse Bair A LOT!: This is his money move. Short Hopped Reverse Bair has a lot of interruptive priority and really messes up these guy’s offense. At worst it should trade if hits cleanly.
Not to mention it can setup into some really nice combos.
-Pivot Throw: Yoshi has an excellent Pivot Throw. Perfect for characters with disjointed hitboxes like Marth and Pit, who pretty much out-prioritize all of your attacks.
-Egg Throw: Use this annoy. Works well against, Marth and Snake but sucks against Pit and Wolf who can reflect and projectile spam more frequently than Yoshi can.
-Last but not least Egg Roll!: This move is perfect because it has awesome priority and totally destroys these character’s spam game. As long as Yoshi’s egg is imbued with the yellow aura and is moving pretty much no move in the game next to Marth/Ike’s Counter can touch him… That includes Charge Shot and Falcon Punch!
Great move to get breathing room.
Sadly, in a head to head confrontation these characters will literally EAT YOUR NORMALS, like you will see their attack just destroy yours, I’ve played against these guys long enough to know that by now.:sad: