If you're looking for a way to access new areas in Ash Gray, you'll need to use existing items like:
* HM04 (Strength): This allows you to move large boulders that block paths.
* HM06 (Rock Smash): This allows you to break through rocks blocking paths.
* HM07 (Cut): This allows you to cut down trees blocking paths.
Make sure you train a Pokémon that can learn these HMs to use them.
Let me know if you have any other questions about Pokémon Ash Gray!