How do you charge up on dbz buu's fury on gameboy advance?

In "Dragon Ball Z: Buu's Fury" for the Game Boy Advance, you can charge your energy by holding down the L button while standing still. This will gradually fill your energy bar, allowing you to perform special moves and use items. Additionally, engaging in battles and defeating enemies will also help you gain energy. Be sure to manage your energy wisely during fights to maximize your effectiveness.