PokéBase - Pokémon Q&A
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Best answer

Go through the sewers. there is a stairway that you have to take. you will have to fight them to be the gang "Leader".

It's only accessible in Spring/Summer when the sewers are flooded. Requires Surf. (And probably Repels unless you want to fight a legion of Zubats.)


  • Enter sewers and go east until you see a stairway(note, that is NOT the one)
  • Go south. after you pass a janitor, there will be a wooden bridge thing right there. dross it. Follow that path til it takes you to the next wooden bridge.
  • Now, there will be this area where there are three bridges leading in different directions. take the bridge that leads you East.
  • Right after you cross that wooden little bridge,there will be a another one. Don't cross it, use surf and follow the path until you see an opening to the sidewalk.
  • Follow the sidewalk south and after passing a door looking space, a little forward will be a space that leads you south.
  • Go up the stairs and prepare to fight 3 people, one at a time.

Good luck with the medal! :)

edited by
Do you need Surf?
yep, you do.
and mew... Useless video is USELESS! sorry for saying it was the one... apparently, no one on youtube knows what the castelia gang is