Question

Is there a way in pokemon white that lets you increase your pokemons weight? I'm trying to find out a better way to use Heat Crash on my Emboar...

Answer 1

No, unfortunately not. The move Autotomize decreases weight, so if the opponent uses that, the power of Heat Crash will increase.

The only other way is with the ability Heavy Metal. Currently only Aggron and Bronzong can get this ability, and only through the Dream World.

Comments

I think that lagging tail might increase weight, not absolutely sure though.
EDIT: nevermind, I was wrong, anyway, they should make an item to make a pokemon heavier.

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See here: http://pokemondb.net/pokebase/23529/does-iron-ball-or-lagging-tail-boost-weight