this is a pretty spacious place to be able to do this kind of thing
in the menu advanced for GTL on items, only can use for vanitys, if i forgot any name of item (example i forgot for metal coat for evolved my scyther to scizor, and i can't see any on gtl, if can i get in advanced "items for evolutions" y can see more easy.)
they could be divided into several menu:
Adventures (items of bag can see)
for evolutions: all stones, metal coat, electritizer, magmatizer... etc.
for fight : life orb, all choices, eviolite, leftovers, focus sash... etc.
for tutors : all shards, metal coat, black belt, blackglasses, magnet, miracle seed... etc.