Snail
Smash Lord
If you play any half decent person, side B is just going to get you owned if you roll at them just like that. Down B is rather predictable, neutral b sucks because any moron can break out in half a second, and up B... Well, okay, up+b is useful, but the hint said some specials, not one.LOL
Up B obv is and if you play any ranged spammer you know that over B is great and can even kill at some percents and down B is also good if you use it surprisingly his reg B is the only move that really is in some ways bad but if you do it right while your both off the stage its good.
and for jiggs well almost any move if you miss is punishable
Seriously, Yoshi's specials aren't horrible but they're nowhere near essential to playing Yoshi except possibly Up+B.