Question

My Gyarados has horrible Special Defense. Are there any ways to somehow raise it?

Comments

What do you want to do with this Gyarados? Are you using it to battle in-game trainers, other people, or something else? Sometimes Gyarados's special defense doesn't matter, and you're better off investing in physical attack and speed.

Answer 1

Here are some items you can use to raise Spec. Def.:

Zinc (using them outside of battle will raise the stat)
X Spec. Def. (used in battle and will only last for the until the end of battle/ when the Pokemon is swapped)
Power Band (Raises Spec. Def. EV's after gaining experience)

Defeating wild Drowzee's will grant Spec. Def. EV's when defeated. (found on route 2 in US/UM)

Hope I help!

Source: this and this, and finally this

Comments

Deep sea scales only work on Clamperl.

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I'll remove that.