Unless you pick it at the start of the game or trade it from someone else, starter Pokémon can't be found legitimately in Ruby. However, there are plenty of hacks and cheating devices that let you...
Put the Ruby game into the DS game-boy cartridge and then in the pearl starting screen you'll see a thing called transfer Ruby Pokemon. Then go to pal park. You need to see every Sinnoh Pokemon, and...
No. Unfortunately, when Pokemon moved from Generation 2 to Generation 3, Pokemon from previous games became untransferrable due to cartrage incompatibility. You can however, transfer Pokemon from...