If you mean Fire Stone, you can get one by talking to Schoolboy Alan on the route between Goldenrod and Ecruteak, before the spot where Sudowoodo is. Talk to him, get his number, and eventually, he'll call you saying he has a fire stone.
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In Pokemon Crystal.
What the hell is a Pokemon crystal
You can't get Moltres in Pokemon Crystal, Only in Pokemon Leafgreen and Pokemon Firered. Including Pokemon Platinum.
There is np VS. Seeker in Pokemon Crystal.
It is not available in Pokemon Crystal. You will need to trade for it from Pokemon Red, Blue, or Yellow.