First, complete the cinnaber island gym and Bill will be outside. Talk to him and say yes. Then you'll go to one island. Go into the big pokemon center and you will see a machine. Talk to the man and he'll tell you find the ruby gem. Go to fire place and battle team rocket. It might take a bit of time for team rocket to battle you so take your chances. After you beat them go inside the cave and explore and you will eventually find the ruby gem. Go back to the pokemon center and give it to the guy by the machine and he lets you go back to Kanto. Defeat the last gym leader (in Viridian city) and defeat the pokemon league. Go back to one island and I think you talk to the guy by the machine. Then go to six island and run to the ruin valley and the dotted hole. The braille reads cut so use cut on the entrance. Then get the instruction booklet you got when you got this game and go to page 61 and translate the braille. Then you find the other gem but a scientist steals it and go to the meadow on five island and go around all the islands until you find the two passwords and then open the door of the lab in the meadow. Battle team rocket and eventually you'll find the gem. Go back to the pokemon center and give the gem to the guy. Then you will be able to trade with ruby/sapphire.
Submitted by pokemonmysterydungeofan01