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The gym leaders are
>a jester (male)
>a sheriff (male)
>a cowgirl
>a forest guard (female)
>a marine animal trainer (female)
>an guy in a trenchcoat
>a falconer (male)
>a mobster with a very tall top hat (male)
Couldn't find a pic with ORAS megas, but Ground has Mega Camerupt and Flying has Mega Pidgeot