In Super Smash Bros. melee how do you get a strong hit with Yoshi

Use fully charged smash attacks or build up the enemy's percentage with random attacks and then smash attack and there you have it a strong hit with yoshi.

A technique I used to get over 1500 ft in home run contest: I made something that I call a meta smash- barely jump into the air and instantly use the meteor smash or whatever the down air is. While Yoshi, barely jump into the air and perform his down air. after a few hits like this, your opponent should have around 60-110% damage. That's when you smash attack.