Aah, I see.

Though you shouldn't depend on moves alone in a battle, I can see why Beldum would seem like a bad choice to you. It's very dependent on being close to the opponent, and though it can tank the damage, it's also not the fastest Pokemon around, so it'd be in a pretty tough spot against faster opponents or ones that could fight at a longer range. Bagon's a neat replacement, because it'll have more long-ranged attacks than Beldum and it's evolved forms, therefor serving as a better partner to a close-range fighter like Makuhita. :toot