Need help catching Latios in Emerald--tips?

Actually, if u're still stuck, you could just have Crobat Mean Look the Lati@s and then use your best False Swiper to at least get it down to 1 health and then give it a status condition, preferably Sleep or Paralysis(Parasect works the best in this case) and then, even if you fail to catch it at first attempt, it'll still be roaming the whole of Hoenn with that Paralysis/Sleep and 1 health.