You're in team rocket base, right? If you are then keep defeating people until one says "whoops I dropped it" then you pick it up and there you have it you can use the elevator.
You have to get the HM01(cut) , teach it to a Pokemon and when you're facing the a tree to cut down open the Pokemon team menu and click on the Pokemon that knows cut and select the cut option. You also need the second gym badge
screwdriver ane hammer
You need a rotom as the first Pokemon in your party and he will open the elevator 4 u. (Untested but have seen it irl (in real life)
Use the move Cut.
the door will be open after you solve the crisis between kyogre and groudon.
Answer the machine QUIZ
First you need a Pokemon with-HM 01Cut,such as Persian.Also a Pokemon with surf.Then use cut on the door and it will open
you need sims 2 open for business to get an elevator.
use cut at the door of ruins
You have to get the national dex from oak and then talk to celio
you must beat all other gym leaders
Build it