That would be... Ho oh or lugia
Raikou roams around Johto. The best thing you can do is walk all around the Johto region, until you find it. If you fail to catch it because it runs away. You can go into your Pokedex and track where it's at from there. A recommended way to catch it, is to use Mean Look on it, that way it can't run away.
use a masterball.
The best and easiest way to get Pokemon from Johto in Pokemon Ruby is to trade them over from other games (Gold and Silver). Pokemon from Johto can be obtained in the same generation Pokemon Emerald after the player completes the National Pokedex.
Between 6pm and 3am in the ice path or mt silver
Find the crystal onix, make it weak and catch it with your best ball
"I want to be the very best, Like no one ever was, To catch them is my real test, To train them is my cause..." I believe that sums up what you do after beating red
There is no best Pokemon to catch, as you train each individually.
Technically, no. You can use an AR, but that's a hack. ------------------------------------- Lies! YOU CAN CATCH IT! So, after getting all 16 badges from Johto and Kanto, Talk to mr. Pokemon, He will give you a blue orb or something like that. Go to the Embedded tower (Look it up) you can catch Kyogre. Net Balls will probably be best.
1. kanto 2 johto 3hoenn 4sinnoh
Goldenrod City, in Johto
cindiquill
the best Pokemon you can catch in Pokemon pearl is heatran