Some examples of these are:
- Adrenaline Orb: In battles, it raises the speed of the holder by 1 stage if affected by Intimidate (Ability), and is a one time use.
- Terrain seeds (Grassy, Misty, Electric, Psychic): In battles, spdef or def gets raised by 1 stage when the holder is in the respective battle terrain.
Those are the few items that I have noticed that are not implemented as of yet and limits the number of playstyles one can take as sets such as the tapu koko + electric seed unburden hawlucha combo cant be used.
Would love to see these items be implemented! Thanks for reading this request hope it works out. Have a great day! c: