What do i do when i've defeated Red in दिल Gold?

well u shud go to professer oak he will let u choose wich starter u want like charmander squirtel या bulbasauar and then when u choose one your done go train the pokemon u choosed and then go to saffron city in the silph co. place talk to a guy he will give u one of the starters of heon i think if u dont find himm go to the club house in vermilion city then get out of the house and the guy il talk to u the go to safron city again and look for him

well, if आप haven't already, आप can try and catch the legendary pokemon. believe it या not, there are a lot of them. that includes the ones from the other regions(or most of them, anyway). i'll सूची the ones i know आप can catch. आप can catch. Ho'oh, Lugia, suicune, entei, raikou, articuno, moltres, zapdos, mewtwo, latias, and latios. आप can also get kyogre only on heartgold, and groudon on soulsilver. आप can also get raquaza if आप trade either groudon या kyogre from the other game (has to be from other game). आप have to look it up on यूट्यूब या something to find out where to get 'em.

Well, आप CAN'T go to every region. On thing आप can do is go to the Silph Co. and get a Hoenn starter, and one a Kanto starter from Prof. Oak.
The Battle Frontier is now available, and the Gym Leaders/ Elite 4 can be re-battled. Here's where all GLs can be re-battled. link

And आप can always catch 'em all!

Sorry if this doesn't help but all I know is once आप defeat Red, go to Professor Oak's lab and he will give आप a choice of Charmander, Squirtle या Bulbasaur. I picked Charmander. Sorry if this didn't help. But I do recall going into a cave going to the new Safari Zone west from Cianwood City. On the floor are Kyogre patterns. Wait, sorry. I just went to Silph Co. and I just got a Treeko, but there are Kyogre patterns in the tower.

well i dont think आप can go to all four regiens mayb u can try completing pokedex? i know this doesnt help...=="

try cating some legendaries या get all the पदक in the pokeathon thing