Hit Points:

Roxanne: 0
Slateport: 0
Rival II: 0
Wattson: 1
Maxie I: 2
Flannery: 2
Brawly: 3
Norman: 8
Rival III: 8
Winona: 11
Maxie II: 11
Tate & Liza: 11
Archie: 11

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Attack (in total + 1 per wild Poochyena):
 
Roxanne split: 2
Slateport split: 3
Rival II: 5
Wattson: 5
Maxie I: 10
Flannery: 11
Brawly: 12
Norman: 12
Rival III: 19
Winona: 23
Maxie II: 30
Tate & Liza: 39
Archie: 55 (56 if spinner hit)

-----------------------------------------------

Defense (take out 1 if no Clark from Slateport to Archie. + 1 per wild Nincada): 

Roxanne: 8
Slateport: 10
Rival II: 10
Wattson: 11
Maxie I: 14
Flannery: 16
Brawly: 16
Norman: 16
Rival III: 18
Winona: 24
Maxie II: 24
Tate & Liza: 24
Archie: 24

-----------------------------------------------

Special Attack (+1 per wild Abra):

Roxanne: 0
Slateport: 0
Rival II: 1
Wattson: 6
Maxie I: 12
Flannery: 15
Brawly: 15
Norman: 16
Rival III: 17
Winona: 18
Maxie II: 23
Tate & Liza: 33
Archie: 36

-----------------------------------------------

Special Defense:

Roxanne: 0
Slateport: 0
Rival II: 0
Wattson: 0
Maxie I: 0
Flannery: 0
Brawly: 0
Norman: 0
Rival III: 0
Winona: 3
Maxie II: 5
Tate & Liza: 7
Archie: 9

-----------------------------------------------

Speed (+1 per wild Taillow/Skitty):

Roxanne: 2
Slateport: 2
Rival II: 10
Wattson: 17
Maxie I: 20
Flannery: 20
Brawly: 21
Norman: 28
Rival III: 31
Winona: 35
Maxie II: 41
Tate & Liza: 48
Archie: 57

To-do: figure out where these EVs can be useful.