The best Totodile is all 15's and each of those DV's matter in some way
15dv Attack saves ~17 seconds
14/15dv Defense makes Well Koffing do 5 damage instead of 6
14dv Special gives the coinflip range on 3 shot snubbull
15dv Special gives benny kakuna range and 30-36 razor leaf roll(instead of 32-38) on rival 3 bayleef
15dv Speed saves 2 seconds
13 and 14dv speed are required before you begin losing more time to speed than just the 2 seconds
15dv HP just helps you die less(particularly prevalent in falkners gym), sometimes the difference between healing or not

 The list of best Toto's
1- FFFF
2- FFFE
3- FEFF
4- FFDF
5- FFEF
5- FDFF
6- FEDF
7- FEEF
8- FFDE
9- FFEE
10-FEFE
12-FEDE
13-FDFE
14-FDDF
15-FDEF
16-FDDE
17-FDEE
18-FCFF
19-FDDD
20-FCFE