Yes, this game has definitely gotten a closer connection to the anime than before. It isn't a direct link between the two, but they share similar connections such as rosters, moves, and so forth. I think I like the idea though, it isn't a direct copy of the anime like in Yellow, but simply shows some references to it, such as the Bonsly case for instance.
Anyway, here is the Serebii link to further in-game trades:
HGSS In-Game Trades
By the way, might I add, I love the overhead shot of the SS Aqua.