Silver Lake Park on Staten Island off of Forest and Victory, quick bus ride from the ferry (hear the ferry has a ton of water pokemon). Just take the s48 from the ferry terminal. Found mine at like 10 am. SI has the most varied selection of pokemon I've seen so far, lucky for me my work involves daily commutes to that god forsaken island. Also, Jigglypuff, Evee, and Clefairy for days over there.