Best Ground type to add?

[.Kaiser]

Hi guys. I'm in a bit of a dilema. I'm playing Platinum, and my team is lacking an effective electric counter, since 2 in my team are weak to electric. I'm currently at Solaceon Town. First, here's my team:
​

Pietro, the Staravia - Lv26(to be 30 very soon)
~Endeavor
~Quick Attack
~Double Team
~Wing Attack​

Napoleon, the Prinplup - Lv30
~Rock Tomb
~Peck
~Metal Claw
~Bubblebeam​

Conception, the Luxray - Lv30
~Bite
~Tackle
~Spark
~Roar​

So, what I'm asking is: What's the best Electric type counter for me to add now? Also, should I change anything in my current team?
Do please help!​

 

[Flare Riqueza]

Give Prinplup Grass Knot might be good option. Will help you against heavy Ground-types.

I would advise...uhhh..Gliscor?

Go to the cycling road (Oreburgh End), use Cut to get to the area below, hunt down and catch a Gligar.

 

[Fire Wolf]

I believe Garchomp can help you, its found in a secret entrance to Wayward Cave which is under Cycling Road and in Platinum, you can catch it straightaway as you pass through Wayward Cave as there are no strength boulders. Garchomp is pretty powerful as well.

 

[.Kaiser]

Going with Garchomp then!
BTW, what's the best moveset?
I never used a Chomp.

 

[Ruin Maniac]

A good moveset for Garchomp is

EQ- forv electrics
Firefang- For them goddamn ice types
Brick break-Good fighting type move
Crunch- Dark type for psychics

A good mixed moveset and good for pretty much most of dragon type weaknesses =]

 

[Fire Wolf]

I think something like this could work well:
- Earthquake
- Dragon Claw / Dragon Rush
- Fire Fang / Stone Edge
- Brick Break / Crunch.

 

[.Kaiser]

~Earthquake
~Dragon Claw
~Stone Edge
~Brick Break
it is!

EDIT:
OMG! I just caught my Gible, and guess what - it has an Adamant nature!
I love my luck.