Where can I find each of the hold items that boost the power of move types by 10% in Emerald?

Question

There should be one for each type (17 in Gen. 3).

Comments

No items boost the power of all moves of a type by 10%. There is an item (muscle band) that boosts all physical attacks by 11/10 (or 10%) and there are 17 items that boost all attacks of a particular type by 6/5 (or 20%). Which ones are you talking about?

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Examples:
The NeverMeltIce increases Ice moves by 10% - where is that?, the Charcoal increases Fire moves by 10% - where is that?, etc.

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No, they increase the power by 20%.

Answer 1

These boost the power of the mentioned typed moves by 20%, not 10%.

Bulbapedia page on this (so you can follow the links for more details)

• Black belt (Fighting)
  Held by Black Belt Nob's Machamp (after fourth battle)
• Black glasses (Dark)
  Route 116
• Charcoal (Fire)
  Lavaridge Town
• Dragon fang (Dragon)
  Held by Dragon Tamer Nicholas's Shelgon (after fourth battle)
• Hard stone (Rock)
  Trick House (Puzzle 3 prize), held by wild Aron and wild Lairon
• Magnet (Electric)
  Trick House (Puzzle 6 prize)
• Metal coat (Steel)
  Held by wild Magnemite and wild Magneton
• Miracle seed (Grass)
  Petalburg Woods, requires HM01 (Cut)
• Mystic water (Water)
  Weather Institute (held by gift Castform)
• Never-melt ice (Ice)
  Shoal Cave
• Poison barb (Poison)
  Held by wild Cacnea and wild Roselia
• Sharp beak (Flying)
  Held by wild Doduo and wild Dodrio
• Silk scarf (Normal)
  Dewford Town
• Silver powder (Bug)
  Held by Bug Maniac Jeffrey's Masquerain (after fourth battle)
• Soft sand (Ground)
  Route 109, held by wild Trapinch
• Spell tag (Ghost)
  Held by wild Duskull, wild Dusclops, wild Shuppet, and wild Banette
• Twisted spoon (Psychic)
  Held by wild Abra

Comments

Wherever you said, "after fourth battle," it's really after third battle or starting fourth battle.

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That's what it said on Bulbapedia.

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I just looked at the page on re-matching trainers myself. It means after the fourth battle overall. It would be after the third if you didn't include the initial one before any re-matches.