Im gonna go to Lombok in december. Would like to know if need to get vaccination against malaria or other diseases.
Unfortunately, as @Cmaster hints at in his comment, no vaccine for malaria exists.
The best ways to prevent malaria is taking anti malarial medicine and by avoiding mosquito bites.
According to the British National Health Service, the malaria risk in Indonesia varies from area to area. Lombok has apparently been deemed "low risk" for malaria. It might be better to consult with a doctor who specializes in travel medicine.
The CDC recommends the following vaccinations for travel to Indonesia:
Some travelers (visit link on top to see if you are one of the travelers who it's recommended for):
Hepatitis B, Japanese Encephalitis, Malaria, Rabies
Also Indonesia requires proof of yellow fever vaccination if you're traveling from a yellow fever 'risk country', the list of countries is here: http://wwwnc.cdc.gov/travel/yellowbook/2016/infectious-diseases-related-to-travel/yellow-fever#4728
Go to a travel clinic
There should be a travel clinic specializing in this somewhere near you. They will take into account your medical background, current vaccinations and know which diseases are a problem where you are going.