Mega Swampert has the ability Swift Swim, which doubles its Speed stat in Rain.
No, you will need to trade for them or transfer them via Pokemon Bank to get them in Pokemon Omega Ruby and Alpha Sapphire.
No, there are no roms for Pokemon Omega Ruby and Alpha Sapphire currently nor a working 3DS emulator. (They are also incompatible with the Desmume emulator.)
You have to transfer it from your Pokewalker. You get it on Icy Mtn. Road.
It evolves by happiness
You can get two ferry tickets:The ticket for the SS Tidal is obtained by completing the Delta Episode.You can get the Eon ticket by Streetpassing someone with Pokemon Alpha Sapphire or Omega Ruby.
The ability of Mega Diancie in Pokémon Omega Ruby and Alpha Sapphire is Magic Bounce.
The game Pokemon Omega Ruby and Alpha Sapphire has not yet been released. The game will be released in November. When the game comes out the ability of Primal Kyogre will known.
There is no roller skate item in Alpha Sapphire.
The new Mega Evolutions that premiere in Pokémon Omega Ruby and Pokémon Alpha Sapphire are Swampert, Sceptile, Latias, Latios, Rayquaza, Diancie, Beedrill, Pidgeot, Slowbro, Steelix, Sableye, Mawile, Sharpedo, Camerupt, Altaria, Glalie, Salamence, Metagross, Lopunny, Gallade and Audino which officially adds up to a total of 46 species being capable of Mega Evolution and there are 48 Mega Evolutions overall as of Pokémon Omega Ruby and Alpha Sapphire's release.
You can catch Skitty in Pokemon Omega Ruby and Alpha Sapphire in the barks of trees.
You battle Kyogre for your chance to capture it in Pokemon Alpha Sapphire after you capture the groudon.
Magikarp
Yes, Tm's in Pokemon Omega Ruby and Alpha Sapphire are re-useable
No, you will need to trade for them or transfer them via Pokemon Bank to get them in Pokemon Omega Ruby and Alpha Sapphire.
Houndour can be obtained by trading from Pokemon X or Y. It cannot be caught in the wild in Pokemon Omega Ruby and Alpha Sapphire.
You will need to trade for Weedle or breed Kakuna. Kakuna can be found only in the Safari Zone in Pokemon Alpha Sapphire and Omega Ruby.
No