No. a Master Ball is
yes, but is has a lower rate catch than ultra ball so ultra ball is or if a Pokemon who's battling Latias and lasts long, timer ball is good at that point
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No ball other than the master ball he is so hard to catch ask anybody
It doesn't matter what Pokeball you use. If you have the Master Ball left over, you could use that to catch Latias. However, Ultra Balls will work the best if you do not have the Master Ball. I'm guessing you don't have a Master Ball since your asking this question, so the best ball to use would be an Ultra Ball. Sometimes it takes more then once to catch a Pokemon, so you just have to be patient and try not to freak out like me when Latias runs away after chasing it for hours. :D
If you have already beaten the elite four and have Latios or Latias already roming around in emerald then you can chase it down till you are in the same vicinity as it and go into the grass to see it appear. toss a master ball at it and you will have the latios or latias. Of course it's best that you clone the master ball first so that you can catch the other one the same way.
Probably an ultra ball or u cood use a timer ball after he is put to sleep. You could also try a luxury ball if u want, i almost caught him in one, im still trying to catch him.better yet use a master ball. it only takes one.
I would recommend that you use on latios or latias w/e which they are because raquaza and kyogre are fairly easy to catch You don't have to use your Master ball on anything. You can use it on Kyogre, but that's the easiest legendary to catch, so I don't recomend it. You could save it for later on, like for Rayquaza. That's MUCH harder to catch! It's at level 70 when you encounter it, but you could still catch it with a normal Pokeball (I did). And then, you could catch Latias with it, which would be the best in my opinion, because unless you have a Pokemon like Wobbufett, with the ability Shadow Tag that doesn't let the opponent escape from battle, then it would be pretty hard to catch. So I say catch Latias with your Master ball.