well you can look at you poke-dex and look for it but, if you go to its location it will go some were else so unless you get luck and your in the same location of latias the only way to catch it is using a master ball so if you have one dont use it on groudon or kyroge you can catch them with ultra balls so save the master ball for latios or latias wicth ever ur after

for more this is my S/N : DarkLatios197

o great its dar-wait.n-e-v-e-r-m-i-n-d-

if hes in water surf were he is he wont go if u fly he will fly some were else thats how i did it when u see him use a ultra ball strat away and keep yor fingers on a and b wen its about to close

first buy alot of ultra balls or timer balls, then get a lvl 40 or so wabafet cause he has shadow tag keeps enemy from running, then buy lots of repels, then go to the place under cycleing road make sure u have acro bike, get on bike use a repel and hop in the grass for like a minute and then enter the building by u dont change route or nothin, leave building and hop in grass and continue process until u find him. Repel has no effect on latios or latias

look for it on your pokedex,choose area,and the red is and it is there.find it and use a masterball.

1. buy maxrepels
2. look around the little water part by maullvill
3. when u c them, it will be recorded in ur pokedex so u can c where it is and find it
4. catch it with masterball and trade it to a new game and then reset game so u can get another one i guess!

The first guys awnser is rong. I caught mine with only 4 ultra balls and a Wobuffet at lv 27.

ummm

i dont know i hate the latis because i met one just by wanderering around but he runs away

The latis area will reset every time you enter a house.So go to a route that has a house in it and look at your pokedex to find out where it is .If it is not in your route then go in the house and go back out.Look at you pokedex to see if it is near you.It can take a very long time to do this.(Ps:You have to at least have seen them for this to work.)
Hope this helps!!!!