Hey there KostatsPist2!
I am sorry to hear that you are experiencing this inconvenience. That is not the correct entrance for Mt Pyre. The correct entrance for Mt. Pyre is on the southern part of Route 121. You will then have to surf onto Route 122 where the entrance is located. I made a little map to help you out:
Additionally if you need any help defeating Mt. Pyre feel free to check out this nice
! Also feel free to reply if you solve the issue, or need any additional assistance! :)
Thank you so much for your help!!