Best way to catch latios/latias
Firts you need a Pokemon with a MEAN LOOK move, that is at least level 35-39...
Then find latios-Ruby/latias-sapphire and then use mean look.. Mean look will prevent them to escape or flea so you have a big chance on catching it in the first time.... Unlike the three dogs in previous versions they all have a move ROAR that will make your own Pokemon away from them... Latios/latias doesn't know this move so you don't need to find them couple of times, you can catch it with MEAN LOOK in your first or second encounter of this pokemon....
Happy to helped
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