I believe that growlithe is the most popular pokemon in PRO.

1~ one can to get one free in viridian maze

2~ one can to get one free in route 8

3~ one can to get a mount arcanine free (evolved growlithe )

 

I suggest to replace the abandoned pokemon in route 8 by other like vulpix, because the trainer cannot abandoned only the poor growlithes.

Also i suggest to replace the aleatory horsea in viridian by a pokemon water that evolved with stone like staryu or shellder, because growlithe and bellsprout evolved throught stones.

If the Horsea is replaced, it needs to be replaced with something common since Horsea, Growlithe, and Bellsprout are all relatively easy to find in the wild whereas Staryu and Shellder are scarce/sparse. Slowpoke could work as another Water Stone evolution.

slowpoke evolve by level not by stone, and in johto there is a staryu abandoned, shellder could be a good option.

 

it could be bellsprout---vulpix---shellder

the abandoned growlith should be available sooner since you can easily catch a better growlithe there... :Frown: