>>32824656I've been a long-time proponent of ditching the type specialist gyms, or at least making them more "gimmicky" as suits the typing. If it's a fire gym then all you need is one decent water type and you're fine, but if that fire type gym used Sunny Day and maybe featured something with Solar Power then it could be a bit more challenging to work with, and even teach new players about how some of these strategies that they wouldn't otherwise be aware of work.
You could get a *lot* more challenging with things like you mentioned, where a gym leader could focus on pokemon with high special defense and then inflict burn status to reduce physical damage, or specialize in poison/confuse with a lot of draining moves so you just have to sit there using antidotes while your pokemon smacks itself in the face and he sucks the life out of you. Show people how nasty certain combos can be, and don't focus on one specific type. Let them do this kind of thing with 3-6 different typings so you *really* have to dive in and build a solid team to take them on. It'd be a hell of a lot more challenging and fun.