Re: Simple Questions/Simple Answers v.4 (Gen IV/V)
No it won't. Belly Drum's effect is making your Pokémon's current Attack +6. There is no way of making it increase any other stat.
Can Belly Drum stack with Zen Mode? As in, if you use belly drum to max out Darmanitan's attack and "almost" activate Zen Mode (activates < half HP), will its Special Attack become maxed out instead?
No it won't. Belly Drum's effect is making your Pokémon's current Attack +6. There is no way of making it increase any other stat.