Yes the only catch is you can catch certain Pokemon in ruby that sapphire can't get and vice versa but the pokedex is the same.
You cant have the ruby and sapphire at the same time because you have to give the ruby to celio in order to get islands 4-7 which is were you get the sapphire
Sapphire and Ruby were released at the same time, then Emerald was released later.
the name ruby comes from groudon since it's the same colour as sapphire comes from kyogre since it is sapphire
Sapphire and ruby are oxides of Aluminium Sapphire and ruby are oxides of Aluminium
The ruby and sapphire are on fire red and leaf green don't worry about the in ruby sapphire or emerald.
Same time they do as in Ruby.
you
Same as in Ruby sapphire or emerald.
Combined with the sapphire the ruby and sapphire will allow you to trade with ruby and sapphire and emerald.
No. In order to trade any Pokemon from ruby and sapphire, you need to find and give the ruby and sapphire to celio on first island.
Well there are a little bit of difference's with saphire and emerald. but I'm not sure if its the same with ruby.
Same way you do in Ruby.