Unobtainable stuff for Gen VII

Items:

Items that are one-off:

1. Apricorn Balls

Currently Event exclusive:

1. Snorlium Z

 Unobtainable Fossils:

1. Claw Fossil
2. Root Fossil
3. Armor Fossil
4. Dome Fossil
5. Sail Fossil
6. Jaw Fossil
7. Old Amber

Unobtainable Berries:

1. Pokéblock Berries(besides Bluk and Pinap Berries, for Natural Gift)
2. Rowap Berry
3. Jaboca Berry
4. Enigma Berry
5. Custap Berry
6. Durin Berry

Items that seem to be dummied out:

1. Elemental Gems 
2. Scarves
3. Relic Items
4. Flutes
5. Mulches

Others:

1. Odd Keystone 
2. Fluffy Tail
3. Shoal Salt
4. Shoal Shell

Unobtainable Mega Stones:

1. Aggronite
2. Altarinite
3. Ampharosite
4. Audinite
5. Banetite
6. Beedrillite
7. Blazikenite
8. Cameruptite
9. Diancite
10. Galladite
11. Gardevoirite
12. Heracronite
13. Houndoomite
14. Latiasite
15. Latiosite
16. Lopunite
17. Manectricite
18. Mawilite
19. Medichamite
20. Mewtwonite X
21. Mewtwonite Y
22. Pidgeotite
23. Steelixite
24. Sceptilite
25. Swampertite
26. Tyranitarite

 Unobtainable Z-Crystals:

1. Mewnium Z
2. Pikashunium Z
3. Marshadowium Z

Pokémon:

Mythicals:

1. Marshadow 
2. Alternate Color Magearna

Unobtainable Forms:

1. Pikachu in a cap

 Unobtainable Hidden Abilities:

1.  Raikou
2. Entei
3. Suicune
4. Heatran
5. Rowlet
6. Dartrix
7. Decidueye
8. Litten
9. Torracat
10. Incineroar
11. Popplio
12. Brionne
13. Primarina 
14. Oranguru
15. Passimian
16. Tapu Koko
17. Tapu Lele
18. Tapu Bulu
19. Tapu Fini