First of all, that's still better than most gym leaders. Most gym leaders you can sweep with one Pokemon.
And again, how would you know to use a Fire type in the gym battle if you don't know what's good against Fairy and you don't know that her first Pokemon is Mawile?
But at the same time, your Poison type is also weak to Mr. Mime, so it could go either way depending on your stats. I went into the battle with a Scolipede and it got destroyed by Psychic before it could touch it.
I kinda already looked up all their teams and stuff for shame True though, better than sweeping with one- but that's why 6 pokemon of diverse dual types would at least make that a lot harder. I really regret picking on Valerie she's so pretty and weird. Like how I imagine a certain kind of straight guy like' Zooey Deschenel [she is such Marmite]
Whoa O_O I thought Scolipede was fast and had decent attack? I suppose if Mimey survives and puts up a reflect :O This is why a Poison/Psychic or Poison/Fire or Poison/Steel should exist so many concepts there ripe for the picking too! [Neurotoxins, caustic acids, toxic heavy-metals ]