Like in modern Pokemon games, TMs are no longer single-use.

You no longer need a Link Cable. Pokemon like Alakazam, Gengar, and Machamp evolve at Level 50, while others like Scizor and Steelix use new items or stones.

This post-game area is heavily populated with Johto species, making it the primary hub for completing the second half of your Pokedex.

All 251 Pokemon from Generations 1 and 2—plus a few necessary Gen 3 babies like Azurill and Wynaut—are catchable within the game.