first you must catch 60 Pokemon or up and then go to proffeseur oak's lab and then he will look your pokedex and there's Gary after talking to professeur oak go to vermilions city and talk to the mann and go to one islnad talk to celios he has something for you to say.............
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Zapdos:Power Plant Articuno:Seafoam Islands Moltres:One island's volcano Mewtwo:Cerulean Cave after beating the elite four and fixing Celio's Machine Suicune:Roaming Kanto after beating elite four. You must have chosen charmander. Raiku:Roaming Kanto after beating elite four. You must have chosen Squirtle. Entei:Roaming Kanto after beating elite four. You must have chosen bulbasaur. Mew:Long past nintendo event/trade
Unfortunately, there are no Joto Pokemon in Ruby or Saphire. However after beating the elite four, they are available on Emerald, Fire Red, and Leaf Green.
Sunkern is found in the Safari Zone in Pokemon Emerald. It is in the Johto section, origionally blocked off by two men in green suits. After you defeat the Elite Four and receive the national pokedex, that area should be accessible.
After beating Giovanni the last time as the gym leader you should get the TM earthquake.
You have to have at least 60 different kinds of Pokemon on your pokedex then go talk to professor oak. your rival shall also appear and he will give both of you a national pokedex.