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The Primal Pokemon in Pokemon Omega Ruby and Alpha Sapphire are Groudon and Kyogre.
The Starter Pokémon in Omega Ruby and Alpha Sapphire are Mudkip, Treecko and Torchic.
You can catch Skitty in Pokemon Omega Ruby and Alpha Sapphire in the barks of trees.
You can find Water Stones in Pokemon Omega Ruby and Alpha Sapphire at the museum.
Yes, Tm's in Pokemon Omega Ruby and Alpha Sapphire are re-useable
The ability of Mega Diancie in Pokémon Omega Ruby and Alpha Sapphire is Magic Bounce.
You can catch Snorunt in Pokemon Omega Ruby and Alpha Sapphire while it is feeding on snow and ice.
You can catch Beldum in Pokemon Omega Ruby and Alpha Sapphire when asleep because it launches its claws into cliffs.
You can catch Torkoal in Pokemon Omega Ruby and Alpha Sapphire when the black smoke and the fire dies down.
These Pokemon can be found before the National Dex: Latias (Alpha Sapphire), Latios (Omega Ruby), Kyogre (Alpha Sapphire), Groudon (Omega Ruby), Regirock, Regice, and Registeel. These Pokemon can only be obtained in the Delta Episode: Rayquaza and Deoxys. Post-National Dex Legendary Pokemon are: Regigigas, Ho-Oh (Omega Ruby), Lugia (Alpha Sapphire), Heatran, Mesprit, Uxie, Axelf, Palkia (Omega Ruby), Dialga (Alpha Sapphire), Giratina, Cobalion, Terrakion, Virizion, Reshiram (Omega Ruby), Zekrom (Alpha Sapphire), Kyurem, Raikou, Entei, Suicune, Tornadus (Omega Ruby), Thundurus (Alpha Sapphire), Landorus, and Cresselia.
No
Primal Groudon is a fire and Ground-type Pokémon and will be seen in the Omega Ruby and Alpha Sapphire game.