If your talking about the desert resort place in the battle frontier island, than all you do, is go south if you come in north and if you come in the south go north, the desert is must easier than others.
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just go in desert pass and go to the right way viola there is an ancient tomb,first beat the elite 4
After u win world championship, you go to Sky tower in KOSAKA city(Lauren), you will meet Eusine, win and he will give u rainbow pass.
Once you defeat the elite 4 in emerald, go to Fallarbor town, go to the left edge of the town where you will find a house named fossil maniac's house,enter the house where you will find a small tunnel, enter the tunnel, on going further there will be an exit of the tunnel, after exiting you will find yourself in the desert under pass.
no. with a liberty pass, you get victini, level 15
You have to get the Rainbow Pass to get to 4 Island in Pokemon.