Your game as corrupted or in other words stuffed. The same thing happened to my Pokemon silver and gold so yea i know what it feels like.
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if you used the clone cheat on your game you might of corrupted your save file, meaning youll have to buy a new game if you ever want to save it again. theyre cheap on eBay because theyre so old.
There's Vizzed. It can save your game ... but it can't use Cheat Devices.
Larvitar can be found in Mt Silver. It's a rare pokemon so it wont appear that often so you will need to stay around the area for awhile.
In Pokemon Crystal.
What the hell is a Pokemon crystal