The rest of the city’s West side is pretty much entirely taken up by the Driftveil Market, a huge building full of stalls.  A side entrance on the West of the building near where Charles is motoring back and forth will let you come up behind a fruit stand and grab a TM- TM36, which contains Embargo.  Embargo has a narrow use situation, as all it does is prevent the opponent’s pokemon from using items- held or applied by the trainer- until it leaves battle.  This sounds neat, but isn’t much use most of the time.

The Market contains four stalls, effectively.  The bottom-right one is for bitter medicines- less expensive healing items that cause the pokemon they are used on to become less friendly with their trainer.  The number of pokemon and moves that rely on or just benefit from high friendliness values is staggering, so unless you’re specifically raising something to use Frustration, which there’s no reason to when Return is exactly like it but powered by friendship levels, you shouldn’t bother with the herb shop.

The top-left stall sells Moomoo Milk, a healing item that will restore 100 HP to a pokemon that it is fed to.  However, at a price of 500 Poke per bottle, it’s only more efficient than Hyper Potions until your pokemon start passing about the 115 HP mark.  Until then it’s okay, but don’t overstock or you could find yourself with excess.  Thankfully, the maid in the trailer back on Route 5 will buy them at price, it’s just slow going to hand them over to her one at a time.

The stall in the bottom-left of the Market is sold out when you get there, sadly... thanks to Charles.

A Team Plasma-N member is sitting right between the two left stalls, selling incenses that can be held by pokemon to improve the power of attacks of a particular type.  She also sells Lax Incense and Full Incense, which are needed for certain breeding tricks, Pure Incense, which helps reduce wild pokemon encounter rates, and luck incense, which improves your money inflow from battles.