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I've always thought that a dual-type leader would be an interesting late-game challenge, but in the spirit of fairness it would be a type with a shared weakness. Specifically, i'd like to be a smith themed gym leader with dual fire/steel type specialisation (and a shared ground type weakness, naturally). Would show up with either a Heatran or a Kartana if challenged in the battle frontier/PWT equivelent of the region.