Crevice Cave on Blizzard Island (have guide book with me and recently completed)
To rescue Scizor in Explorers of Darkness, you need to unlock the Marine Resort location and complete the missions there until you encounter Scizor. Rescue Scizor by defeating the Pokemon that has lured it into a trap. This will make Scizor grateful and it will join your rescue team.
Enter WNWYJXTK&5C14N3-P4NM8K&C In wonder mail & You can do this only when you have met Scizor
There are 20 floors. Then you automatically unlock Crevice Cave, where Scizor is being held captive.
First you goto Mr. Mime who is located near the Kecleon Shop. He'll tell you about Scizor and how he went to Blizzard Island, and how he disappeared. Then you'll be able to go. In Blizzard Island, there are 3 destinations: Blizzard Island, Crevice Cave, and Deep Crevice Cave. At the end there will be Scizor, frozen in ice by a Frosslass. You'll have to defeat her. Then after rescuing Scizor, he gives you the Secret Rank.
buhetkyrroeirlke
You find him on a post-chapter in explorers of darkness. Mr. Mime in Treasure Town will tell you about a missing explorer named Scizor. He will tell you the place where he is. WARNING; DO NOT FORGET WHAT MR. MIME SAID. You have to battle Frostlass to rescue Scizor. I'm not sure if you are able to recruit Frostlass or not. SORRY ;). Scizor will give you some "Special" rewards for saving him. THANKS, GOOD LUCK! -G577hazeooze
In mystifying forest
yes some dungeons you can't enter but if you rescue scizor from froslass (crevice cave) you can get to all mystery dungeons
at the end of crystal crossing
Shimmer Desert
No. You'll have to find some more codes specifically for explorers of sky. (Sorry I don't know any. I only have Time and Darkness.)
You find him in spacial rift.