You need to get past Team Magma to advance in Pokemon Ruby. To get them to leave route 112, you have to find Captain Stern.
find captain stern in the mueseum.
Because You need to give the Devon Goods to Captin Stern
nincada evolves at level 20 in Ruby/Sapphire it also evolves into shedinja so you better leave space in your team
im pretty sure its right of lilycove city and in a cave
Go In Stern's Shipyard At Slateport City And Talk To An Old Man Named Dock
Simply defeat your rival after beating Team Magma/Aqua at the Weather Institute on Route 119. She/he will give you HM02 (Fly) after you defeat them.
You Root for you team not route
Yes, go to Mt. Ember, and you'll find two Team Rocket Grunts talking if you beat them they will leave. So then you enter, and walk around till you find the ruby.
To get the ruby it's in Mt. Ember off to the right where the team rocket members are or were they will leave after you beat the Pokemon league. For the sapphire it's in the dotted hole and to open the door you need to use cut.
After defeating the team at Mt. Chimney in Pokémon Ruby, Sapphire, or Emerald, you should head to the nearby Jagged Pass, which leads to Route 112. From there, you can access Fiery Path and eventually reach Route 113. In addition, you can explore the area or return to Mauville City to continue your journey.
You don't get the symbol in ruby.
You have to dive beside Sootopolis in different spots until you find one with an entrance, then you will find the sub. dive on route 128 and look for a cavern it should be there