None of the ingame trade Pokemon have any special moves that can't be obtained by other means such as egg moves, TMs, etc.
The closest thing to a special deal you get is with Lt. Surge's pikachu, which gives you a foreign Pikachu (it's French in the English version of the game, English in the japanese version, and may vary depending on what you're playing) that you could use for the masuda method of breeding for shinies.
In the Power Plant in Route 10, you can give a Dugtrio to get a Magneton holding a Metal coat if you want the item.
In the Pokémon Center of Pewter City, there's a guy who will give a Xatu holding a wacan berry in exchange for a haunter.
There are some other trades not listed as well, but nothing with any noteworthy items or moves.