I would have expect alot more discussion......
I guess I'll get things started...
First, Yoshi can actually kill MetaKnight quite easily, as Yoshi has 3 Different unavoidable kills on a grab release.
- Yoshi has Fair spike that is unavoidable on a Grab Release from the Edge, which can kill at 48% Fresh. However it is determine on the distance away from the ledge.
- Yoshi has an Nair, also unavoidable, From a Grab Release from the Edge, which can kill at about 85% Fresh, and activated point blank.
- Lastly, Yoshi has a unavoidable Usmash from the ground on Release, which kills at 115% Fresh
Yoshi also has a very good defencive game against him with Pivot Grabs, and a Solid Usmash with Invincibility Frames, as Kiwi already explained. Yoshi has the added benefit of a Projectile, which works well at gathering Damage when MetaKnight is off the ledge, or can pester him if he decides to hold his ground. Since MetaKnight's attacks are Multihit based, it makes it hard for him to pierce through his Double Jump Armour when edgeguarding. Also his poor airspeed makes it hard for MetaKnight to chase after him if he gets through.
Anyways, Discuss