All you have to do is go to the beach (were you and partener met) and lapras should be on the beach. Just talk to her and she asks if you want to go to hidden land.
Go to the Hidden Land
Go to lapras on the beach she will take you to the hidden land beat it and you are ask if you want to continue to temporal tower.
go talk 2 lapras on the beach he'll take only you & your partner back he won't take any other pkmn..VERONICA
Go to the beach after you gragaute from the guild,Lapris will be there,talk to him.He says "Would you like to go to the Hidden Land?".Say yes.Lapris will then say "Only the holy may go to the hidden land,so only You and (What ever your parners name is)May go,Is that ok?Ok,get past the Hidden Land then you will be at the entrance of Temporal Tower!
You can be any level just finish brine cave then you'll see this Pokemon called Lapras he should transport you to the hidden land ( he is at the beach )
Land of Fire Konohagakure "Hidden Leaf Village" Land of Wind Sunagakure"Hidden Sand Village" Amegakure"Hidden Rain Village" Land of Sound Otogakure ""Hidden Rice Village"" Land of Water Kirigakure "Hidden Mist Village" Land of Lightning Kumogakure "Hidden Cloud Village" Land of Earth Iwagakure "Hidden Rock Village" Land of Waves
go 2 lapras on beach and go through hidden land hidden highland old ruins and temporal tower and temporal spire
The Hidden Land was created on 2006-02-14.
When you can go to the hidden land go back to where Uxie, Mesprit, and Azelf were and fight them for them to join. And here's a tip with a speacil item go to the Mystifing Woods 13B and you can find Darkri after you beat the post game
I think Lapras will come back to the beach area and you can talk to her to go, but I haven't played the game in a wile...
Going back
you would go back to town find who took u there they may be at a beach or in the guild orin ur home or in town