After You beat the elite four in Pokemon Ruby Version, you can go to the sky pillar which is east (---->) of Pacifidlog town, and capture Rayquaza at level 70, (it is very strong so i would bring as many ultra balls as possible) capture a roaming Pokemon (Latias for sapphire, and Latios for ruby) and go to trainer tower.
Chat with our AI personalities
NO (only on ruby)
depends on the game. If you edit your question, I would be happy to answer.
you have to beat the elite four and go to the pal park or transfer it from ruby,saphier or emerald
beat the elite four with 60 owned Pokemon in your pokedex. celio will not tell you to get the ruby and Sapphire until u do
Depends what you mean by "beat." some consider it beaten after the Elite Four is defeated. But there are still a ton of Pokemon to catch, so others consider the game beaten after you catch all 386 Pokemon available in ruby.