What are all the items in ORAS that are unreleaseable/fool proof?

Some ways it ca n be foolproof are not able to be sold to shops, or non-discardable. What are all the items in ORAS that have these conditions? Also: most Key Items are like this.

Pleaselog inorregisterto add a comment.

Items that cannot be sold in Marts:

The same applies to the items that cannot be discarded except for Mega Stones, and Master Ball.

Source:Tested In-Game.

I believe that the only items that fit the aforementioned criteria areKey Items. All Key Items in ORAS are as follows:

Acro Bike/Mach BikeAqua Suit/Magma SuitClear Bell/Tidal BellDevon Parts/Scope/Scuba GearDNA SplicersExp. ShareEon Flute/TicketGo GogglesOld Rod/Good Rod/Great RodDowsing MachineIntriguing Stone (before it is made into the Pidgeotite)GracediaLoot SackMeteorite (until Rayquaza eats it)Mega BraceletOval Charm/Shiny CharmPokéblock KitReveal GlassLoot SackVs. RecorderWailmer PailS.S. Ticket

There are also several items that are only Key Items for a limited time, such as the Scanner, Letter, and Sea Mauville Room Keys. For a complete list of Key Items, lookhere.

You can also not sell any TMs, HMs, Mega Stones, or Master Balls. Note that Master Balls can be ‘Trashed’, so they sort of count as unreleaseable.