Hmm, too a look at the blogs both are 0.24c, speed might as well be equalized.
So from what I understood, Link is around 3x stronger than base Gallade.
Well, if I had to take a guess: Gallade's entry in HeartGold states: "Because it can sense what its foe is thinking, its attacks burst out first, fast and fierce" this may actually backfire and lead Gallade, who is primarily a physical fighter with very low Special Attack, to strike Link at close range and be caught off guard when Link not only reacts properly to his attack by being as quick as Gallade is, but also noticeably stronger and having his trademark sharp senses. It's unlikely that without prep time, Link has an elaborate plan already that Gallade can read to react properly nor know the differences in strength between the two of them, not to mention Link is a notable quick thinker to come up with ploys on the fly when fighting to turn tides in his favor, something that 's not so easy to keep up during the action of a battle.
Setting up boosts is risky when considering it leaves the user open for a moment, at which Link can deal critical damage given Gallade, despite his tier, has pretty lousy physical defenses and Link, by not having magical equipment yet won't go for abilities that Gallade could endure much better. If Gallade loses the pace of the fight, it becomes even less viable to try to setup boosts.
Gallade may try to teleport, but teleporting is still subject to reaction speed and Link does have incredibly sharp senses that complement his reactions, so after an initial surprise I don't think the move would lead to Link being unable to track down Gallade. If Gallade tries to make distance, Link will likely go for a Deku Nut and leave Gallade open.
Now Gallade does have good options, Confuse Ray can leave Link swinging around which if Gallade is lucky enough, and can use it to setup. Protect is a viable defense, but the move has a strict timing and risky to use in succession. Growl and Charm may weaken Link, but they won't stop Link's attack exactly, so Gallade may still get hit with a powerful slash. Hypnosis could turn the fight, but it also has some lousy accuracy and may be hard to pull if Link manages to push back Gallade. Icy Wind is a good choice as well, being able to slowly chip away Link's speed, but this is something Link could block with the Kokiri or Hylian Shield.
May be taking too many assumptions, but trying to piece an scenario here >_>
