How do you get past the man blocking dotted hole in Pokemon fire red?

You're likely referring to the man blocking the entrance to the Dotted Hole in the Viridian Forest. He's a member of Team Rocket and won't let you pass until you've beaten the gym in Pewter City.

Here's how to get past him:

1. Head to Pewter City: Travel east from Viridian Forest to reach Pewter City.

2. Challenge the Gym Leader: The gym leader, Brock, specializes in Rock-type Pokemon. You'll need to defeat him to progress.

3. Return to Viridian Forest: After beating Brock, return to the Viridian Forest. The Team Rocket member blocking the Dotted Hole will be gone, allowing you to enter.

Let me know if you need help with any other parts of Pokemon FireRed!