I haven't seen him in a while

[pokeguy76]

Does Gary appear in FR/LF?8)

[AKA Pokemon Fan]

As your rival, Blue, yes, I beleive he does.

[The Muffin Man]

Yes. Gary/Blue appears in all the same places in FR/LG as he did in RBY.

[Don't Run With Scizors]

I've also sighted him once or twice on the Islands, as well.