Your trip to the Cipher Lab is your first chance to infiltrate Cipher's Shadow Pokémon operations. Therefore, there are several Shadow Pokémon you can capture in this area.
The lab is guarded by the Hexagon Brothers, a team of six Cipher Peons that each favor a particular type of Pokémon. Apparently, they're not very smart, because they can't remember how to count to six. They will do a short "sound off" and count to six…sort of…
Anyways…you must defeat at least one of them before you can enter.
If you go into the Lab and back out again, the Hexagon Brothers will do another "sound off" (this time they count way past six) and you can rebattle them, with replacements for their Shadow Pokémon you presumably snagged (except for Greesix).
Leave the garage and go through the facility's west door, which leads to the Lab. The Healing Machine and PC inside the door are a welcome sight! You can save a lot of money by returning here for healing instead of using items.
Walk toward the elevator to trigger an ambush by Cipher Peon Corla.
Take the Revive from a chest in the corner before climbing the stairs. Go south from the top of the stairs to overhear a conversation between Professor Krane and Cipher AdminLovrina. She tries her best to convice Krane that he should help Cipher, but he remains committed to purifying Shadow Pokémon.
After Lovrina leaves, continue south, until ambushed by another Cipher Peon.
He drops the ID Card in his rush. Pick it up. On the right side of the room is a Great Ball. Leave the room by the north door and take the first left to find an elevator. Before you can use it, you must fight another Cipher R&D.
After you defeat Naps, Krane joins you. Open the chest to get a rare Leaf Stone, then leave and head for the elevator that takes you down to the main floor.
Before you can escape the Cipher Lab, one last opponent stands in your way: Cipher AdminLovrina. Lovrina is a tough trainer who is not used to losing. With all the battles you've won getting this far, though, you are well-prepared to handle her.