Meadow Area Pokemon

[Leader Shadow]

Morning-

Jigglypuff--level 15-17
Hoppip--level 15-17
Skiploom--level 17

Day-

Jigglypuff--level 15-17
Sunkern--level 15-17
Hoppip--level 16-17
Skiploom--level 17

(after you've beaten the all eight Gyms)
Raticate--level 40
Chansey--level 42
Skiploom--level 40
Nuzleaf--level 48
Geodude--level 45
Clefairy--level 42
Wooper--level 40
Seedot--level 45
Nosepass--level 45
Riolu--level 45

Night-

Jigglypuff--level 15-17
Marill--level 15-17
Wooper--level 15-17
Clefairy--level 17

Surfing-

Magikarp--level 15-17
Wooper--level 15-17
Marill--level 16-17

(after beating all eight Gyms)
Skiploom--level 47
Masquerain--level 42-46

Old Rod-

Magikarp--level 15-17
Poliwag--level 12-15
Poliwhirl--level 16-17

Good Rod-

Magikarp--level 22-24
Poliwag--level 22-24
Poliwhirl--level 24-27
Gyarados--level 28

Super Rod-

Poliwag--level 35-36
Poliwhirl--level 35-38
Gyarados--level 42-45