Pokémon Diamond and Pearl/Veilstone City

'''Veilstone City is the home to Gym Leader Maylene. Team Galactics main HQ and warehouse are also found here. The city also has Sinnohs Department Store and Game Corner.'''

To progress the story it is recommended to go to the gym first which is in the southwest corner. Outside the gym you will find Lucas/Dawn who will say that you are getting stronger and that he's working on his Pokédex which is a lie since he was in the Game Corner. After the talk he then runs off and you can head into the gym.

Cobble badge


Maylene is a fighting trainer. Her gym is set up so you have to face all of the trainers here and its a puzzle where you have to slide yellow walls to be able to get to Maylene.

Flying and Psychic types are good against this gym, Flying type being the better one since Meditite is also a Psychic type. Also, using Fire attacks will work well on Lucario, since it is a Fighting/Steel.

Trainers

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Gym leader battle

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With the Cobble Badge in hand you can now use fly and luckily for you you can get it in the same city if you follow the below instructions.

Once done here head outside then Lucas/Dawn will say that they dropped their Pokédex and Team Galactic picked it up. They then ask you to help them at the warehouse in the northwest corner

Entering the warehouse
Before heading to the warehouse there are a few items to pick up on your way. Just outside the gym is a man who will give you TM63. Inside the second house next to this man is a clown who will give you a Coin Case which holds you gains that you get from the Game Corner

Once you pick up those items head on over to the warehouse to meet up with Lucas/Dawn. When you get to the warehouse, Lucas/Dawn says that Team Galactic won't give back their Pokédex and wants to fight them in a double battle

Trainers

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Once you beat the Grunts they will head inside the warehouse. Follow them into the warehouse where you see a Grunt who remembers you from the Valley Windworks. Besides that, there is HM02 and that's the only thing you can get in here.

Go back out and explore the city to do some shopping at the Veilstone Department Store, sightseeing at the meteorites and gambling at the Game Corner.If you don't want to explore the city then head south to Route 214 to resume your journey.

Items

 * TM63 Embargo - from man outside gym
 * Coin Case - from clown inside 2nd house next TM man
 * HM02 Fly - Inside warehouse
 * Tiny Mushroom(hidden)(DP) - to the left of the warehouse after you exit it the first time

Game Corner
To get coins here you can go to the counter and exchange 1,000 pokebucks for 50 coins or 10,000 pokebucks for 500. The latter is a safer option so you don't have to go back and forth. You can also talk to various people in the building to get some free coins.

The slots mechanics are very different in Sinnoh but you can win coins quicker if you get the bonus round. The first is where you put in 3 coins by pushing x2 and the slot will start to spin. Instead of pushing one button three times to stop the spin you now have to push, and. The chances of winning are low unless a Poké Ball appears on the bottom screen. This is a random chance that 4 different kinds of Poké Balls show up: Premier, Great, Ultra and Safari. With these balls you get a guaranteed win of 2 cherry Poké Balls for 40 coins(Normal Poké Ball), 3 replays which is a spin again for free(Great Ball), 3 Pikachus for 10 coins(Ultra Ball), 3 of the same random symbols(Premier Ball), and 3 moon Stones for 15 coins(Safari Ball).

To get to the bonus round you need a Clefairy to come out of any of those Poké Balls and then get 3 Team Galactics or 3 7s. There are also 3 kind of Clefairies which can affect the chances of multiple bonus rounds, Ditto transformed(less chance), normal(no effect) and shiny(higher chance). In the bonus round you have to follow the Clefairys directions for 15 spins, it will point left for, up for and right for. The only time you should not follow the directions is when the moon above the Clefairy turns red as it might make Clefairy fall asleep and end the bonus round at after your 15 spins are done. If you get 10+ consecutive bonus rounds then you will get a free TM64 from the woman behind the desk.

Unlike other regions, the Coin exchange for prizes doesn't have any Pokémon but it has a wider range of items and TMs. The most notable TMs are Pyschic, Ice Beam, Flamethrower and Thunderbolt. Great TMs to get this early on in the game so I suggest saving up and getting them

Veilstone Department Store
Before you enter there is a hidden Revive(DP) in the trees to the left of the department store

Like the other region department stores, the Veilstone Department Store sells all sorts of things that can't be purchased anywhere else that can help boost your Pokémon or to decorate your base. On the wall near the elevator on each floor there is a description of what's on each floor.

The first floor aka the Trainer Zone is like a Super Poké Mart as it has everything that a regular Mart has plus better versions of the Potions, the Poké Balls, and other ailments.

The lady to the left of the entrance will give you a mask of the starter Pokémon that is weak against your starter Pokémon which is used for contests.

The 2nd floor aka Battle Collection sells vitamins and battle items. Vitamins can increase a base stat of your Pokémon permanently while the battle items will increase the stats temporarily in a battle. You can only use the same vitamin on a Pokémon 10 times.

The man at the bottom of the desk will give you the Pokétch app called Counter which counts the amount of steps you take. This is a helpful app for hatching eggs.

The third floor aka the TM Corner sells various TMs. The top cashier has defensive TMs and a great Pokémon catching TM called False Swipe which leaves the wild Pokémon with 1 HP.

The bottom cashier has the best offensive TMs for fire, electric, grass, ice, and Fighting types as well as Hyper Beam. Definitely buy these TMs sooner than later.

The fourth floor aka Poké Dolls and Goods sells items that you can use to decorate base

The fifth and final floor aka the Rooftop Plaza Also a man in front of the elevator will hand you a Sticky Barb.

Also, compare Super Potions to Lemonade. Lemonade is the way better deal since it cost half of that of a Super Potion and it restores 30 more HP than it does! Stock up and save!

Meteorites
Ever noticed the meteorites around Veilstone's western side of town? If you have in your party, touching one of the stones will change its form. The middle rock turns Deoxys into its Normal Form, the one above that into the Speed Form, and the two below that, from left to right, turn it into the Attack or Defense Form.

Pokémon groomer
The house right next to the gym you will find a massage girl/groomer who will massage your Pokémon once a day and find a free accessory for contests. These massages raise your Pokémons happiness