The elite four will open and they will be stronger and you can now trade with ruby, sapphire and emerald.
Pokeman here, if you got "PokemonSaphire I think you're a classic man. Now, it's almost impossible to catch all Pokemon in Sapphire, ruby or emerald unless you got ruby, Sapphire and emerald all together, two gameboy advances and two trade things. Now, if you got them, you have to trade all of the Pokemon from ruby and emerald to Sapphire. Seriously, I know. I got ruby and I'd kill to get every Pokemon in it.
There will be a remake of ruby and sapphire later on, but for now just wait. They should be making the remake or making the special for black and white.
Yes if you give Celio the ruby and sapphire he connects with Lanette and all Hoenn trainers this means you can now trade between ruby, sapphire and emerald and even Pokemon colosseum and Pokemon xd gale of darkness.
fire red: after you give the sapphire to celio, now you can trade with Pokemon ruby, sapphire and emerald
There's no way to catch Deoxys in Ruby or Sapphire in the wild unless you use a GameShark or an Action Replay to make it appear in the wild. Deoxys can only be caught via Nintendo events which have since passed. Now it's only available if you know someone who can trade you one.
No only in ruby and sapphire and emerald just trade one from those games to leafgreen and now you have it.
After you have obtained and restored the Sapphire gem, you now are given the ability to trade with trainers from the Hoenn region. Mind you these need to be your real life friends, and they can give you all the Pokemon from Ruby, Sapphire, and Emerald.
On field, it'll attract Pokemon to you. In Pokemon X/Y/Omega Ruby/Alpha Sapphire, you can now attract hordes of Pokemon. In battle, it decreases your opponent's evasiveness.
You can now catch mewtwo in cerulean cave, you can now catch entei/raikou/suicune depending on which starter Pokemon you chose, try the trainer tower on seven island, finish the pokedex because now you can trade with ruby and sapphire and emerald and Pokemon colosseum and Pokemon xd gale of darkness, train your Pokemon to level 100 and have fun!
This has not been confirmed yet or heard of.
Deliver it to celio and now you can trade with sapphire or ruby version. To trade with emerald you need two wireless adapters. Also after that finish the pokedex oh and try the trainer tower.