The Secret Key is an Item first appeared in Version 8 of TPPC.
Obtaining one in TPPCEdit
Currently in Version 8, the Secret Key is randomly obtained from a battle with a Rocket Grunt overrunning the Radio Tower.
The battle consists of three pokemon: Skuntank, Weavile and DarkMetagross. All three pokemons' levels are scaled to match the highest-leveled Pokemon in your party. Skuntank's moves are Psychic, Thunderbolt, Crunch, Cross Chop, Flamethrower, Icy Wind, Hyper Beam. Weavile's moves are Rock Slide, Icy Wind, Crunch, Hyper Beam, Shadow Ball, Flamethrower. DarkMetagross's moves are Rock Slide, Icy Wind, Hyper Beam, Cross Chop, Thunderbolt, Shadow Ball.
You'll know the Radio Tower is overrun by Team Rocket if it says:
Team Rocket controls the radio tower now!
Team Rocket Grunt Team Rocket GruntHope you weren't expecting to get in on the fun! With Team Rocket in control, we're having a special promotion called Ragin' Rocket Friday. Here's how it works: You either battle or you get out. Actually, ignore that last part...
Attaching the Secret Key to the first Pokemon in your party, and venturing the Map Dark Islands gives a chance to unlock a Secret Passage in the Map. This message appears when you unlock the secret passage:
Clicking the link will let you fight the Missing Radio Engineer. Their team consists of MrMime, Steelix, Porygon-Z, Magnezone, Electivire, and Shaymin. Their levels, save for Shaymin, scale to the highest-leveled Pokemon in your party.