This is what you do: You put loudred in the top right cage and put Jigglypuff in the cage in front of it (close to the guard). You make loudred scream and immediately make jigglypuff sing. Now the guards asleep.
Now you switch off between cyndaquil and vanillite making them attack the bars until it becomes cold and brittle, then you make roggenrolla use rock blast on the brittle bars and you're out.