I guess you want to breed, if not still some advise.
Huge size, champion import parents etc does not guarantee a good healthy dog. When I say healthy I also mean temperament. So do your research well. Plus champion parents to not guarantee that the pup will also be like the parents. Only good producers produce good pups and not necessary for a good producer to be a champion. You must have heard of Aron and Yugo and Indian champion now sold down south, but as far as I know he is not a good producer.
There are a lot of Rottweilers all imports in the market, but no one knows the track record nor do they know if they are free of health issues which can come up later.
My advise will be not to go in for a Rottweiler (its too common), if you still want to go in then see the parents, try and handle them yourself which can be tricky....ha ha ha. See what they have been producing and ask about health issues from the puppy owners. Generally if there are any health issues then they will come out later in the life or will be hidden as the breeder wants to make his money.
There are a lot of breeders all over India. Call the Kennel Club and get numbers and addresses or ask them for the IKG. See the web for the numbers. All the best.