I'm trying to charge Gohan and Ginyu's. I managed to finally do it, but with only R2, but that is super awkward to do since that button is on the far side of the controller. I wish I could just hold L+M.
Are you talking about Adult Gohan's or Kid Gohan's? I think the version of Adult Gohan's where you can spend more meter is actually done with different buttons than the level 1. I don't have the game booted up but I remember having to switch to like H+S or something to get the version I could spend multiple meters on.