Quote Originally Posted by Evil Mewf0ur
I had a who;e bunch of sharked Pokemon in my Ruby version, but then traded with a rental Emerald version, and magically they all appeared in the Pokedex.
Wow, any special reason you felt the need to dig up an over-three-and-a-half-year-old post? Seriously, everything in this topic is outdated to the point of uselessness.
In order to see dex data for pokémon not normally obtainable in Hoenn, you need to upgrade the Pokédex to the "National Dex" which can hold data for all 386 species to date. You get the National Dex after becoming League Champ in Fire Red or Leaf Green (if you have high enough Dex completion in that game), and then from that point forward, any trades you make between that game and Ruby, Sapphire or Emerald will spread the National Dex to the Hoenn game.