Question

Can you get more than 1 Metal Coat in ORAS?

Answer 1

Yes.

Dexnav chaining Skarmory has a chance of holding a Metal Coat.

Wild Magnemite and Magneton has a 5% chance of holding one too.

Source

Hope I helped!

Comments

everyone has the same source lol

Answer 2

Yes

Well, only as an item on Pokemon. There's a 5% rarity of them appearing on Magnemite, Magneton, Metang, Bronzong and Bronzor. You can also get them off DexNax Skarmory. However, you can only get 1 by normal means (finding it on the ground or receiving it from an NPC).

Serebii

Answer 3

You can get one from New Mauville and from some wild Pokemon too:

Skarmory(DexNav only)
Magnemite(5%)
Magneton(5%)
Bronzor(5%)
Bronzong(5%)
Metang(5%)

Thoughif you are in a hurry, get a Pokemon with Compound Eyes for a boost of 50%! Other than this, there is always trading.
Source: Serebii's page on the Item Metal Coat