Groudon, Latios, Rayquaza, Regirock, Regice, Registeel.
The first legendary is Groudon ofcourse, the second is Rayquaza, then Latios, and all 3 Regi's (Registeel, Regice, and Regirock) that's all the legendarys that you get in Pokemon Ruby version.
groudon entie latias latios
Groudon. That's it.
Pokemon ruby's version IS Pokemon ruby.
In Pokemon Ruby there is the 3 regis, rayquaza, latios, groudon, deoxys, and jirachi. So there are 8 legendarys.
Mew does not exist in Ruby version.
You can't catch Zekrom in Ruby version.
No, Swinub is only obtainable in Pokémon Ruby Version by trading.
There are 26 legendary Pokemon in Pokemon black/white version.
She is not in that version
This legendary Pokemon can only be acquired on Ruby Version through trade from Sapphire Version or Emerald Version.
You cannot catch Ponyta in Ruby version, nor Sapphire version. You much catch it in Fire Red or Leaf Green and then trade it to Ruby or Sapphire.