After you defeat Red you can 1.)catch other legendary Pokemon and do events like the celibi,pichu, or arceus event. 2.)You can also get the red orb from Mr. Pokemon and get Groudon.
(from somebody else) you can also beat the eleat four again and then beat red again
:D
you can do is cat the 3 legend Pokemon
In Pokémon Black 2 and White 2, you will get the C-Gear after beating Cheren, the Aspertia City Gym Leader.
At 'N's Castle after beating the Elite Four.
After beating the game, you can go to the Dreamyard to find Latios if you are playing Pokemon Black 2 or you find Latias in Pokemon White 2, and after capturing them, they will leave behind an item called the Soul Dew.
You can go there after beating the elite four.
After you beat Ghatsis on Black or White, you cannot find him again.
After beating Benga in the White Treehollow, he will give you a Shiny Dratini however you will have to get it from him at Alder's House in Floccesy Town.
Hall of Fame and then you can adventure through new places.
in the giant chasm after beating the elite 4
When youre versing the champion
You can't. After beating N at his castle and obtaining the National Dex, you can catch Pokemon from Sinnoh.
There is only one rod in Pokemon Black and White. You will receive it after beating the elite four. It is the SUPER ROD. it lets you catch a ton of new pokemon.