That's not possible since you don't have the national dex.
You can catch Raikou if your starter Pokemon was Squirtle, and after you beat the Elite Four.
you cant you oaf!
Kyogre and regirock-regice-registeel
the only way to catch mew is to defeat the elite four
yes after beating the elite 4 you can catch both him and groudon.
pickachoo
You can't catch Rayquaza in sapphire or Ruby without beating the Elite four, but in Emerald you can. Sky pillar wont be there in Ruby and sapphire before you beat the Elite four. The only thing there is deep water. (If you don't believe me go take a look.)ture its stuiped
You can get an Eevee in the trophy garden, or from Bebe after beating the Elite 4.
dialga palkia after beating the elite four
You can get an Eevee in the trophy garden, or from Bebe after beating the Elite 4.
By trade
your starter has to be squirtle and you need to defeat the elite four