Saffron City Dojo — Celia's Stupid Romhack
Every wild Pokémon here, by encounter method.
Saffron City Dojo lists one Pokémon across 3 encounter methods (old rod, good rod, super rod), all at level 20.
Opens up at Saffron City and Silph Co.. 9 trainers here:
Angry Nerd James (1)Angry Nerd James (2)Angry Nerd James (3)Angry Nerd James (4)Black Belt HitoshiBlack Belt MikeBlack Belt HidekiBlack Belt AaronBlack Belt Koichi