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!
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The three thunders. thunderbolt ,thunderpunch, thundershock.
A Metal Coat can be found in New Mauville. The Metal Coat is on the right of the machine.
You obtain HM Dive in Mossdeep City from Steven after getting the Mind Badge.
Mudkip is available as a starter pokemon in more than one games. They are Pokemon Ruby, Pokemon Sapphire, Pokemon Emerald, Pokemon Omega Ruby and Pokemon Alpha Sapphire.
It is not a selectable Pokémon in Ruby. If in doubt as to which characters are "4th generation" you can consult the Pokédex website. Gible didn't exist in the original Ruby game. In Pokemon Omega Ruby, however, you can catch a Gible (as a Hidden Pokemon) on Route 111.