Japanese Pokémon Red, v1.0 with as it appears on the Super Game Boy.
>Catching everything I don't have except for what I can evolve
>Grinding EVERYTHING up to match the next Gym Leader's strongest Pokémon (Koga's next, so I need to reach level 43 with six more Pokémon)
Chose Bulbasaur > Ivysaur > Venusaur, Shell Fossil for Kabuto > Kabutops, Hitmonlee, and Jolteon
I don't evolve any stone Pokémon until they reach their last learned move (ie. Pikachu's last move is Thunder at level 43)
By the final Gym battle (level 50), the only Pokémon I'll have that haven't evolved will be Gloom (learns Solar Beam at level 52) and Dragonair (evolves at level 55). I might grind everything up to level 65 for the league after that. My Pokédex will be at 123/151 caught by the time I challenge the league, and Mewtwo will be 124.
The only Pokémon I won't be able to see without trading will be Magmar, Pinsir, Omastar, and Mew, for a grand total of 147/151 seen. I'm using VBA-M, and I don't seem to be able to trade though.