The best way to approach with Kirby is to somehow force them to approach you. Kirby approach=FAIL.
Meh, they aren't THAT bad... Once you try approaching with Ganon you start to appreciate Kirby's approach options...
However, it is best if they approach you. Here's some ways to bait attacks/approaches:
-run towards, then away (mixing it up with DAs from time to time so they don't see it coming).
-random SHs, and some SHs towards them, with a AD'd SH back (mixing in some BAirs to keep them guessing).
-Running shieldgrabs (I'm not sure if wat I mean is what Gonzo means or not... I just run at them, shield, then grab though I'm always holding the same direction (not sure if that changes anything).).
-Random FFed Nairs (ACed) aimed at nothing (Doesn't work against most people, but some don't seem to know it ACs, or forget, and run straight into the next attack.).
-Random FC (people tend to run at you after shielding the shockwave, just make sure you're far enough away that you aren't giving away free damage.).
-Random Inhales (Bad idea, but it sometimes work. Inhale to make them approach, then stop as they come and hurt them.).
(Yeah, I know I put random "insert move", but how else can I say it? It works. If it's unpredictable, they don't know what to expect, and those are some ways to stay unpredictable.)