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An early gym that uses no-weakness pokemon? Have them be a kid who's full of himself and a real know-it-all brat:
>Tynamo
>Spiritomb
>Signature poke is Trickster Sableye
A breeder gym leader that uses 2 dittos, an exeggcute and any pokemon of your choosing that has flame body. They should also always be riding a bicycle.
A racer gym leader that uses fast as fuck pokemon (or ones that are said to be fast, anyway) like Pidgeot, Rapidash, Shedinja, etc
