The Great Marsh in Pastoria has undergone a fair few changes since Diamond & Pearl. Firstly, the marsh area isnt filled with wild grass, merely outlined with it. A number of Pokémon are found in the Great Marsh and only in the Great Marsh so you will have to keep coming back if you want a specific Pokémon. Each day, there are specific rare Pokémon that are seen only by looking out along the Marsh with the binoculars upstairs. There you will see the Pokémon and the area they are in. There are six areas in the Great Marsh, and you can walk between them or have quick access on the internal train.

Nat No.	Pic	Name	Type 1	Type 2
#024		Arbok Available After National Dex FR Inserted into DS
#046		Paras Available After National Dex
#102		Exeggcute Available After National Dex
#115		Kangaskhan Available After National Dex
#114		Tangela Available both Before & After National Dex
#163		Hoothoot Night Available both Before & After National Dex
#164		Noctowl Night Available both Before & After National Dex
#193		Yanma Available both Before & After National Dex
#194		Wooper Available both Before & After National Dex
#195		Quagsire Available both Before & After National Dex
#285		Shroomish Available After National Dex
#315		Roselia Available both Before & After National Dex
#316		Gulpin Available After National Dex
#318		Carvanha Fish Available After National Dex
#339		Barboach Fish Available both Before & After National Dex
#340		Whiscash Fish Available both Before & After National Dex
#352		Kecleon Available After National Dex
#357		Tropius Available Both Before & After National Dex
#397		Staravia Available both Before & After National Dex
#399		Bidoof Available both Before & After National Dex
#400		Bibarel Available both Before & After National Dex
#406		Budew Available both Before & After National Dex
#451		Skorupi Available both Before & After National Dex
#452		Drapion Available After National Dex
#453		Croagunk Available both Before & After National Dex
#454		Toxicroak Available After National Dex
#455		Carnivine Available both Before & After National Dex