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Ledah would have a Ninetales. Period. Charizard's kickass but doesn't really suit him. And considering Ledah's personality, I can't really see him having more than one or two Pokémon.
Just watch him name it Lorelei so he can say "Lorelei is all I need." Personally, I would have thought that maybe Charizard works better simply because it flies and thus can keep up with Ledah when he takes off. (It can potentially also carry him in the event that he collapses or something, which he might see as a useful asset for his "I work alone" mentality.) The only other flying fire-type I can think of is Moltres, and... no. Not so much. :/ That's more Aghart than Ledah.