Try making sure you've done these things:
-Retrieved the Ruby from Mt. Ember on One Island and given it to Celio
-Battled the Team Rocket members in Icefall Cave on Four Island and met up with Lorelei
Then I think you should be able to get into Dotted Hole.
Head to four island and find a cave in the north in here you must find the HM7 which is waterfall now use that to go up the waterfall in the cave and go to the ladder you will find lorelei and rockets beat them and go back to six island when you get to dotted hole the scientist isn't there, use Cut on the door to open it.
Use cut
When the scientist is not in front of the door, use Cut in front of it. when you go down the hole, here is the pattern up left right and/or down
White power
First you have to save lorelia from four island (Icefall Cave ) Then you must go to the doted hole and the scientist will not be there . Then you need to use cut on the door and then get the sapphire .. enjoy
Defeat the Rockets in Island Four's Ice Cave. You'll need Waterfall for that. And you need Cut to open the door to the Dotted Hole in Island 6
If the scientist is blocking dotted hole go to four island and go into icefall cave in there find HM7 which is waterfall use it to go up the waterfall in the cave then go to the ladder you will find some rockets and lorelei beat the rocket then leave to six island he shouldn't be blocking dotted hole anymore now use the move Cut on the door to open it.
try to take the sapphire inside the dotted hole and the scientist that was once blocking the door to the dotted hole will tell u (to get inside the dotted hole form it into a question and type it up in the bar above)
To enter dotted hole, use cut at the door to get inside it.
You need to use CUT on the dotted door
the dotted hole is opened by using cut when you stand in front of the door
the dotted hole is on six island at the en do of the island. you have to use cut on the door and you are in
Use cut on the door.
Use cut
When the scientist is not in front of the door, use Cut in front of it. when you go down the hole, here is the pattern up left right and/or down
White power
First you have to save lorelia from four island (Icefall Cave ) Then you must go to the doted hole and the scientist will not be there . Then you need to use cut on the door and then get the sapphire .. enjoy
Use Cut on the door.