Pokemon of route 4

[Cheese]

On the ground;

Poliwag (Common)
Level: 13-19
Seel (Common)
Level: 12-18
Krabby (Common)
Level: 11-15
Marill (Common)
Level: 13-19
Eevee (Rare)
Level: 9-14
Absol (Very rare)
Level: 10-16

In the water and at the waters edge; (You'll need to find a hole in the ice)
Magikarp (Always)
Level: 5-10
Spheal (Common)
Level: 11-15
Feebas (Rare)
Level: 8-15
Dratini (Very rare)
Level: 5-10

In the trees;
Swablu (Rare because they are hibinating)
Level: 11-18
Spinarak (Common)
Level: 7-14
Pineco (Common)
Level: 8-17
Natu (Uncommon)
Level: 10-18