Legend of the River King GBC Codes not Working

I use them in Retroarch but the codes only make the Infinite Stuff only go to 255 and that also goes down when I spend the Money

Got cheats in Cheat Database.

Tried all GBC Cores

Works with GB Rom but not GBC Rom.

How do I get them to work?

Read this on this GameFaq:

So needing a Cheat Device that is 2.1 would stop the Codes Working?

Link to FAQ:



Anyone Know what why it does this?