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Currently, my team consists of:

Mawile ("Teri")
Level 39
Hyper Cutter
-Flamethrower*
-Flash Cannon*
-Crunch*
-Faint Attack

Magnezone ("Elliot")
Level 42
Sturdy
-Thunder*
-Discharge
-Magnet Bomb*
-Lock-On*

Lucario ("Gregory")
Level 39
Steadfast
-Aura Sphere*
-Force Palm*
-Reversal
-Counter

Empoleon ("Alexander")
Level 57
Torrent
-Cut
-Rock Climb
-Waterfall
-Surf

Skarmory ("Talon")
Level 44
Sturdy
-Fly*
-Steel Wing*
-X-Scissor*
-Defog*

Aggron ("Gwenevere")
Level 45
Sturdy
-Strength*
-Metal Claw
-Iron Head*
-Hyper Beam

I'm still leveling them up to get in that order, but I would like some advice. As is common knowledge, picking only one type leaves one open to their weaknesses. My problem exists in elminating these weaknesses.

For dealing with Fire, I have Aggron and Empoleon. For dealing with Fighting, I have Skarmory. However, I am still open to Ground.

True, Skarmory is immune to ground, but there are no attacks that are super-effective. I've been using Empoleon for fighting Ground mostly, but that can't last forever since I'm going against higher and higher level enemies (Despite having the National Dex, I haven't beaten the Pokemon League. I got to the last Pokemon against Cythia before losing, but that was with a different team altogether).

I've marked with a star moves I want to keep, but I'm willing to change on strong advice.

Also, unrelatedly, does anyone know where the Move Deleter is? I want to change one of Empoleon's to an Ice-type for Cynthia's Garchomp.

If you want my advice on how to ix your empoleon, I would say breed another. one or two rounds of breeding and a few eggs will give you a strong piplup. That way you can specifically raise it to do what you want it to do