What do you with the old aber stone on FireRed?

You can't do anything with the Old Amber Stone in FireRed. It's a placeholder item with no purpose in the game.

Here's why:

* Old Amber Stone: This item is intended for use in the Generation IV games (Diamond, Pearl, and Platinum).

* FireRed: This game is part of Generation III, which doesn't have the mechanics to utilize the Old Amber Stone.

What the Old Amber Stone is used for:

In Generation IV games, the Old Amber Stone is used to revive an extinct Pokemon called Aerodactyl. This is done by taking the Old Amber Stone to a specific location and interacting with it, causing Aerodactyl to revive.

FireRed doesn't have Aerodactyl, so the Old Amber Stone is useless.

If you're looking to use the Old Amber Stone, you'll need to play a Generation IV game.