After visiting Sea Mauville in Pokémon Omega Ruby, you typically continue your journey by heading back to Route 108. From there, you can explore the ocean routes and challenge the remaining Gym Leaders, including the Sootopolis Gym. Additionally, you can engage in battles with trainers and seek out new Pokémon to catch as you prepare for the Pokémon League.
A Metal Coat can be found in New Mauville. The Metal Coat is on the right of the machine.
It's the same Wattson event as in Ruby and Sapphire, but now you have to wait until after the Kyogre/Groudon event to be able to unlock the sidequest. Find Wattson in the middle of Mauville, go to new Mauville and turn off the power, and return!
No, Navel Rock cannot be accessed in Pokemon Omega Ruby and Alpha Sapphire. Lugia or Ho-oh appears in Sea Mauville on the Abandoned Ship after getting the Scanner.
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Flying rub can be obtained in the game Pokémon Ruby at Route 104, from one of the characters near a cuttable bush. It can also be obtained in the game Pokémon Omega Ruby in Mauville City.
You can get it in the bike shop in Mauville City.
mauville city
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In Pokémon Omega Ruby and Pokémon Alpha Sapphire, the Mauville City Gym Leader; Wattson has three Pokémon which are Magnemite, Magneton and Votorb, Magnemite is at Level 19 and its moves are Volt Switch, Tackle and Thunder Wave, Magneton is at Level 21 and its moves are Magnet Bomb, Supersonic and Volt Switch and Voltorb is at Level 19 and its moves are Volt Switch, Rollout and Charge.
Mauville
on mauville city
the daycare is next to mauville city