2 Q's

Yes you can go to space to cach deoxis or jirochi it is a very complicated thing there are five steps first complete pocedex secon beat elite four see every Pokemon on pokedex and capture all Pokemon on pokedex it varys on what Pokemon you get I do not know good roughts on to get latias

I don't care who says it, but outer space DOES NOT EXIST in any Pokemon games. I have even went so far as to look into the programming for the game. No data for outer space exists in the programming. Outer space is what is known as a "beta level" and was deleted before the game was released. As for Latios, spray repel and repeatedly go from one route to the next, then back again. Also, use your pokedex to check if Latios is in the area you are in (This is annoying, but I can verify that myself). Thanks goes to you for using this method of answer searching.

You can go into space by catching latios and raising it to level 67 or 77 (if 67 doesn't work try 77) and then talk to the scientist in the space station in mossdeep city and he will tell you can go in space (you can go only ONCE so save) keep walking forward and you will find deoxsys. To get latios look on the pokedex for where it is and WALK there don't fly to the nearest city as it will move. It will still move if you walk to it but if you keep on walking to it,it will be more likely to appear.hope this helps.