You have to catch one in emerald after the elite four in Pokemon emerald and you have to trade the other lati from Pokemon sapphire or ruby.
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have Pokemon pearl and emerald both in the ds. it will say migrate from emerald on the Pokemon pearl screen. that`s all you need to know.
If you saw the news on latios/latias that means you have already defeated the elite four and now you can catch the latis, you can still beat the elite four if you want but for fun catch the latis then destroy the elite four with them.
If you are speaking of the egg that the lady gives you near the hot springs then the Pokemon is a wynaut. It is a pretty crappy Pokemon until you train it to level 18 when it evolves into a wobbufett. The wynaut will most likely have shadow tag which is helpful with the latis since it prevents escape!
yes
In the both the Hoenn and national pokedex, Pokemon number 367 is Huntail.