How do you get pass the rock that is in way to Lavender Town Pokemon

You're likely referring to the boulder blocking the path to Lavender Town in the original Pokémon games, Red, Blue, and Yellow.

To move the boulder, you need to first obtain the Strength HM from Rock Tunnel in the Sevii Islands area.

Here's how to get past the boulder:

1. Reach Rock Tunnel: You'll need to have your S.S. Anne ticket to travel to the Sevii Islands, and complete the Cinnabar Island portion of the game.

2. Obtain Strength HM: Inside Rock Tunnel, you'll find Mr. Fuji who will give you the Strength HM after you help him deal with the Team Rocket members inside.

3. Head to Lavender Town: Return to the path blocked by the boulder, and use the Strength HM on the boulder to push it aside and open the way to Lavender Town.

Let me know if you have any other questions about Pokémon!