battle theyr boss maxy
go to lilycove city and surf straight over right from lilycove city but first u have to beat team aqua/magma
After the player defeats the administrator boss of Team Magma at their hideout in Lilycove City, the boss flees on the submarine. The player should then go on to explore Mossdeep and Sootopolis. The boss is now in the Seafloor Cavern below Sootopolis.
Mossdeep city here is how you get there. Beat team magma in their hideout and beat team aqua in their hideout to gain entry to mossedeep city. Mossedeep city is right of lilycove city
you have to beat the lilycove team aqua base
Surf east from Lilycove to go to Mossdeep City.
To get past the Wailmer you wil have to defeat team Magma/Aqua. The base is to the north of the Lilycove city beach (Don't forget ot get the masterball when your in the base). One Archie or Maxie is defeat and he flees, you are free to go east to Mossdeep city.
Defeat Team Magma in their hideout at Mt. Chimney's Jagged Pass and defeat Team Aqua in their hideout at Lilycove City to be able to travel to Mossdeep City. Mossdeep is east of Lilycove; you will need to Surf to get there.The 7th gym is located in the Mossdeep city. From Lilycove, travel the seas with "Surf". Keep travelling to the right and your will soon get to the Mossdeep. Go up ahead the Mossdeep area and you will find a gym. Inside is Liza&Tate. They hold the Mind Badge. The Mind Badge allows for the HM Dive to be used outside of battle. Additionally, it will raise the special stats of the player's Pokémon.
Go to Steven's House.
In team magma's base near lilycove city
They have ran to a cave nearby the last city
To get to Mossdeep City, you have to defeat the other six Gym Leaders, and you need Surf. In Mossdeep, there is a Psychic-type Gym, and Team Magma will be in the Rocket place.
In Mossdeep City from Steven after you have defeated Team Magma.