And you thought you wasn't going to get any help soon Alex. Hehe.
Basically all Young Link has against Roy is projectiles. Jab should smack away my Boomerang. Arrows ain't ****. Bombs are catchable. When you break down the projectile wall, I'll have to resort to my CQC. If I jump while approaching I'm basically going to try for a Nair because it's his best approaching aireal. When that happens just shield grab me out of that or at low percents crouch cancel F-smash. But on the off chance you're not quick enough right after the Nair is a D-smash. So as soon as the move connects C-Stick it. Your Dtilt is ******** and will catch anyone off gaurd if they don't know about it. Plus it sets up for fatal combos. Upon edgegaurding, don't be afraid to counter Young Link (Only if I don't sweet spot).
Well that's all I'm giving you. I'm not going to let you destroy me completly.