Well IronGross, I mean like Gyarados with Earthquake, and Rhydon with Swords Dance, moves that they can't normally get in th eolder generation, using them in the older games.
That's the thing. There's no compatibility between the advance games and game boy games. Absolutely none. It has nothing to do with them not naturally learning the moves in the older gens or whatever (GSC -> RBY allows stuff like, say, Ice Punch Electabuzz), it's just that ADV -> gen I or II just doesn't work. Only way you're getting those moves on those Pokemon is by sharking.