r/Pokemondiamond

So I have a question about money sources. I know that in Black and White 2 there are some specific type of trainers that are on some routes and every time you enter the route you reset the encounter and that way you can farm money, EVs from the pokemon they use and reliable experience.

I was wondering if something similar happened in Platinum. I've also considered farming evolutionary rocks and sell them, but that is a slow process.

Maybe it sounds greedy but I come from playing Sun and moon where u can farm high value items to sell at the shop and BW2 where as i've said you can fight some trainers infinetely.

Thanks for your time