Sneaky Goblin at Town Hall 12: max level 8. At Town Hall 18 the cap is level 10. It unlocks at Town Hall 10. Max level per Town Hall: TH10 7, TH11 7, TH12 8, TH13 8, TH14 8, TH15 9, TH16 9, TH17 9, TH18 10.
Tap a Town Hall to open this item there. Dashed: not available at that Town Hall yet.