Karen's Dark-type Pokemon are also complemented with two non-Dark-types that may pose a
threat, though they both share a Poison-type, so your Psychic-types can come out to play
if you've got any.
She'll start off with her Umbreon, which has a lot of defensive stats and Double Team to
make taking it down even more difficult. If you have any attacks like Swift or Aerial Ace,
they'll obviously come in handy, but otherwise just keep striking it with Fighting- or
Bug-type attacks until you get through Double Team. Thankfully it lacks offensive
attacking power.
Gengar is a bit of a pain and it may pull down your Pokemon with Destiny Bond. The turn it
uses Destiny Bond, make sure you don't attack it (unless it's too late for that, thanks to
Gengar's high Speed) and wait a turn for Destiny Bond to wear off. Otherwise you'll just
wind up losing whatever Pokemon you were using to take the ghoulish fiend out with. It
also has Focus Blast, a fairly inaccurate Fighting-type attack that may hit fairly hard if
it hits.
Vileplume, like Gengar, lacks a Dark-type. You should know how to take out Gloom by now
thanks to Team Rocket, and Vileplume isn't that much more challenging. Fire-, Ground-,
Ice-, or Psychic-type attacks will put it in its place pretty quickly.
Karen's Murkrow isn't very difficult either. It lacks defensive stats and, though it will
probably get in a fair hit on you, you should be able to fry it fairly easily. Forget the
fact that it's Dark-type and just focus on exploiting its Flying-type weaknesses, since
that's all it's vulnerable to.
Last up is her Houndoom, and you have to be very careful around this thing! It's
Dark/Fire-type and has fairly fragile defensive stats, but it can hit really hard and it's
pretty fast, too. What makes it particularly deadly is the fact that it has Nasty Plot,
which raises its Sp. Atk two stages! It doubles its Sp. Atk the first time it uses it,
meaning it is going to be hitting you HARD with either Dark Pulse or Flamethrower. It can
easily one-hit KO your Pokemon if it pulls off a Nasty Plot. Unfortunately there's nothing
you can really do against it once it gets set up, so try take it out as quickly as
possible with moves like Surf, Earthquake, Rock Slide, or Cross Chop.
After beating Karen, you'll have beaten all of the Elite Four. All that's left for you to
do now is take on the Pokemon League Champion...
If you have X items like I recommended buying (or you can accept losing money in case the
Champion is just too difficult to beat), go ahead and save your game now (or when you head
into the next room). If you're just going for the longshot, well, just go on through and
do your best!