i can't find the way to 8th gym hoenn (sootopolis city)

[Thai357]

PRO Username: thai357

Have you looked at the FAQ to solve your issue?: yes

On which server issue happened: BLUE

 

What have you done before the problem was there?

N/A

 

What have you already tried to solve the problem?

i was asking many people but still can't find it.

 

Description and Message

i was cleared 7th gym and have dive. i try to find it more than 2 hours but only find the seefloor cavern. need help!!!