You stun them and use lots of ultra or great balls (my friend cought all the legendary Pokemon with great balls) or put them to sleep and do the same thing
P.S. get their health low first ;D
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well if you want to get all of the regis 1 way u can migrate them from ruby or sapphire
You can catch feebas everywhere and occasionally barboach i am unsure where to catch magicarp but there is a way
Noi told everyone you migrate one from Sapphire or ruby version.Import it from poke'mon ruby, sapphire, emerald, or trade.The only way to obtain a Registeel is to trade it from games Ruby, Sapphire, and Emerald.
The only way is if you saved your game before attempting to capture it and if you failed you can reset the game and try again other than that its not possible to retry catching groudon you can however take a groudon from emerald if you failed to catch it or another ruby game. So, no.
You cannot get the Legendary Dogs (or Beasts such as Raikou, Suicune and Entei) in Ruby without either trading for them or cheating for them because they are not available in the wild in Ruby in any way, shape or form. But you can catch it in Pokemon Ruby Destiny-Reign of Legends. But in the original Ruby or Sapphire you can't get it.