No, it is not possible to encounter wild Espurr in Alpha Sapphire or Omega Ruby. It must be traded over from X or Y, if not transferred through Pokémon Bank.
all of them
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.
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.
go to sandgem town, in dawns house a girl there will tell you routes where rare Pokemon can be found, hopefuly she will say a route where beldum can be found
Volbeat can be found in Route 117 with a 4% chance of encountering it. It is increased to 20% in Pokemon Alpha Sapphire.
Eevee can be found on Route 116 after you obtain the National Dex. (DexNav exclusive)
In Pokemon Omega Ruby, Latios can be found in Southern Island after obtaining the HM Surf and going to Route 123. To find Latias, you will need to get the Eon Ticket to fly to Southern Island to get her. Pokemon Alpha Sapphire has the same methods, but with the opposite Pokemon.
No, not all fossils can be found in Omega Ruby or Alpha Sapphire however the fossils that can be found would include the Dome Fossil also known as the Kabuto fossil, Plume Fossil which is the Archen fossil and Armor Fossil which is also the Shieldon fossil can be found in Omega Ruby, the Skull Fossil also known as the Cranidos fossil and Cover Fossil (also known as the Tirtouga fossil) can be found in Alpha Sapphire while the Old Amber Fossil which is the Aerodactyl fossil can be found in both Omega Ruby and Alpha Sapphire.
while inside silph co, there is a room with a man and a teamrocket person on the upper floors. if you defete the teamrocket trainer and talk to the man he will give you a level 25 lapras as a token of his gratatude
In Pokemon Sapphire, Latios can be found in Southern Island.
Yes Pokémon that were introduced following Pokémon Ruby and Pokémon Sapphire are available for capture in Pokémon Omega Ruby and Pokémon Alpha Sapphire. The Pokémon that were introduced following Ruby and Sapphire that can be found in Omega Ruby and Alpha Sapphire would include Drifloon, Braviary, Boldore, Klink, Tynamo, Excadrill, Cofagrigus, Happiny, Audino, Kricketune, Larvesta, Petilil, Purugly, Cherrim, Cinccino, Glameow, Darmanitan, Zebstrika, Binacle, Munna, Maractus, Sawsbuck, Rufflet, Crustle, Azelf, Mesprit, Uxie, Terrakion, Virizion, Cobalion, Entei, Suicune and Raikou.
The Adamant Orb can be found underwater in Route 128 on the Sealed Cavern when diving in the middle.