digicores are used to buy eggs,miracle fruits,leaves and evos. you can find the machine to buy those at Dats the most east shop. but i have to say do not buy the eggs since digicores are 8-12m each you will spend about 20-80m for an egg you can get for 2-10m from other people or for free from the monsters. also one evo is 50 digicores which is about 500m and koreans sell them for 200-220m so you will pay a bit more than twice for an evo which is stupid. though the amount of digicores for a leaf is good and is the only good offer there is IMO.