use flash
You cannot see Kyogre in Pokemon Ruby because it's a version exclusive to Sapphire and can be found in Emerald also.
you go to your room and see the time. Is that simple!
after you beat the elite 4 you should automatically get it if not see professor oak
wait you mean ruby is sinnnooohhh
Use the move Defog.
after you see groudon for the first time but only see it. i no this isn't very helpfull, but ask the question "How do i catch groudon in Pokemon ruby" or ask "Where and how to catch groudon in Pokemon ruby"
You cannot catch/see 'Entei' in Pokemon Ruby. The only way to get it to Ruby is to trade it from Leaf Greean, Fire Red or Colosseum.
A Pokemon
You have to have a ds lite, if you do go down until you see migrate from ruby and then pick the six Pokemon you want.
The sixth gym is in Fortree but before you can go in you have to keep going a little futher until you see Steven on a brige. He will give something to see invisible Pokemon. Then go back to the gym, use it, and the Pokemon will run away.
You Can't Find Ho-oh, You Find It In Pokemon Gold, The Only Way To See It In Ruby Is To Stick Gold In A GBA And Trade With Ruby.
Its easy just go to serebii.net and you will see a list of Pokemon games click on ruby/Sapphire and then once you get to that page press new Pokemon or ruby/Sapphire pokedex then youll see a list of Pokemon.