I believe that unorthodox or uncommon items can really help accomplish specific goals as you've already said. Imo the best unorthodox items are ones that can be used to bluff choice items. The best example I can think of is Gouki's Tyranitar, which has Expert Belt (which is arguably not unorthodox, but Muscle Band could work too!) -- Comes into a Wish Blissey and Pursuits as they protect. Thinking you're stuck the opponent will usually stay in, then you Superpower to defeat the Blissey.
Outside of accomplishing specific goals though I'm not sure if unorthodox items have much use. Usually, items like Life Orb help Pokemon (sweepers) do more generally.
This is an interesting subject :)
Outside of accomplishing specific goals though I'm not sure if unorthodox items have much use. Usually, items like Life Orb help Pokemon (sweepers) do more generally.
This is an interesting subject :)