Is there a gameshark code to gaining boosted exp in Pokemon LeafGreen?

Yes, there are GameShark codes that can help you gain boosted experience in Pokémon LeafGreen. One common code is to set the experience multiplier to 9999, which will give you an enormous amount of experience points after each battle. However, using cheats can affect gameplay and may lead to glitches, so it's advisable to use them carefully and save your game beforehand. Always check for the specific codes compatible with your version of the game.