Pokémon - I only played Platinum so I wouldn't know about the lack of Fire types in Diamond and Pearl

Lord help you if you didn't pick Chimchar as your starter, because that means one of your only primary options for dealing with Bronzor/ong, Snover/Abomasnow, and Sneasel during the –slog–journey through Mt. Coronet to Snowpoint is Rapidash. Assuming you figure out the single route it's located on.

I may still be mad about this, why do you ask?

Same thing happened with Volkner too. The lack of Electric types meant that he randomly had Ambipom and Octillery on his team. And no, he doesn't use Pachirisu.