By donating your account will be upgraded to a premium account which has numerous benefits including no more advertising! and better shiny, dark, ghost and metal encounter rates.
Buy Credits using Paypal/Credit Card
Basic ($10 for 50 credits)
Ultra ($18 for 100 credits) Money ($15 for 100,000 Pokemoney)
If you donate any day of the week, you will recieve a Golden Pokemon (The pokemon changes every day)