If you mean after you beat the 3rd gym leader (or was it fourth?), he runs away to get stronger. Don't worry, you'll see. When you get to victory road, he'll catch you right before you leave Victory Road, and request a battle. Good luck, cause it's one tricky fight after going all the way through Victory Road.
go route112 after you saw team aqua run away in meteor falls and ride the ferri
If your legendary Pokemon run away in Shiny Gold, there is no way of retrieving them again.
use mean look for not leting them run away, ghost Pokemon could learn it
use a ghost type Pokemon with scary face so it cant run away and then use a dusk ball or a net ball and you will get it don't fly or it will run away
they run away into the wild so u can find them anywhere they run away into the wild so u can find them anywhere
you have to thorw a pokeblock, the more the better, but be careful,,,they might run away
Beat the elite four again(sucks right?).
go route112 after you saw team aqua run away in meteor falls and ride the ferri
just run around and you'll find it. but if you go to a town and it was there it'll move. it's a really annoying thing to do .
Run in to a wall and you get a fire type pikachu
It has wireless connection and you can run into other region's Pokemon and you can't do either in Ruby or Sapphire.
If your legendary Pokemon run away in Shiny Gold, there is no way of retrieving them again.
If you are going after the Sapphire, then you go to Five Island and run through the Rocket Warehouse to get the Sapphire.
you have to go to pacifidlog town and surf then you'll run into a horsea and that's how you get a horsea.
u run into her in random places u well want to keep the masterball
you go to the safari run as far left as possible and then run around in the grass and soon enough it will come.
Because you don't take showers