How do i get past?

[Dex]

 

[Darkfire]

another puzzle
you need an HM to move those
go back to olivine
i leave you to find it from there

 

[Dex]

Can you give me another hint? i'm searching forever.

 

[Darkfire]

hint:
OMNOMNOMNOMNOMNOM

 

[Dex]

You're being serious right? xD

 

[Darkfire]

You're being serious right? xD

yep

 

[Dex]

Wow I am such a retard -.- I didn't even check all the buildings, sorry dark if you were yelling at your screen on how retarted I am xD, Thanks alot.