Where are the Leftovers in Omega Ruby and Alpha Sapphire?

Question

For my Terrakion.
It is currently holding a HARD STONE!

Comments

It ought not to use Lefties anyway..
Terrakion prefers Life Orb's extra power / Choice Scarf's speed.

Answer 1

Non-repeatable
- S.S. Tidal (Behind two red crates in the storage room)

Repeatable
- Pickup (Level 81-100; 1% chance)

Leftovers (Bulbapedia)

Answer 2

The Leftovers is located on the bottom floor of the SS Tidal ( The ferry in lilycove/slateport)

Source: http://www.serebii.net/itemdex/leftovers.shtml and expierience

Comments

In the top-left corner.

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Are there any other locations? I missed out on getting them, and can't go get them again because you cant go back on the ferry (in the actual ferry) after your first trip.

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No, and you can go back on the ferry. Ive been on it many times. You can only ride it from slateport and lilycove, it seems, and not from battle resort