You use a masterball.
Red Gyarados is captured by using a Pokeball. In combat with Red Gyarados, a player can weaken the Pokemon and then use a Pokeball to capture it.
It doesn't matter.
Ultra ball weaken it to red the easiest way is the dusk ball
it doesn't matter what kind of pokeball you use it matters how long you take you can catch it with a pokeball as a last resort
Use a pokeball
With a Pokeball Nah but seriously you net to migrate them from a saphire/ruby/emerald cartdrige. you cannot use a dsi as there is not DS port. i am assuming you are playing Diamond, Pearl or Platinum.
Any pokeball can capture mespirit. If you were fast enough to use block, it is like a regular battle. If not, use a master ball or a different ball.
When a Pokemon appears, select battle or catch, weaken it and use a pokeball.
use a pokeball and capture professor oak then sack him, then he gives you a mewtwo
Use a pokeball and wait for their life to be red colour and capture it
i would suggest dusk and ultra balls but if you want to capture it without lowering its hp get a friends lugia and use repeat balls
West of Hearthome city, than use the move waterfall there is a pokeball and it's carbos