FYI, I don't see your reply unless you go to my page and leave the reply VM there, or you could even send a PM instead (VMs are usually better since PMs are limited and you have to delete them over time, PMs are usually for things that might not need to be posted publicly). The server links it as an entire conversation; see the link under this VM. I see the reply here now of course, but not as part of the conversation. ;)
Twist Mountain and Victory Road are the two real maze areas in this game; you'll have a lot of fun there, but make sure to take someone with Strength so you can create shortcuts through the area. Remember if you already encountered Cobalion (Mistralton Cave) that you can find Terrakion in Victory Road as well, but let me tell you from personal experience, it's a biyatch to capture.
As I posted in the thread, you can get your very own Excadrill. It's available as a Drilbur in four caves; the catch is that you won't find it randomly just walking around, so the idea is to take a Pokémon that is slightly stronger than anything else you find and take a couple of Repels with you (always good to stock up on them AND Quick Balls, you'll like having them when you're looking for Pokémon Swarms later, such as Wynaut on Route 2 and Pineco on Route 16 which can be as high as Lv.55, and most of mine were Quick Ball captures). Once inside the cave area (NOT the outside section), activate a Repel and wander back and forth until a dust spot appears. At times you'll find items (such as Normal Gems and other types, evolutionary stones, and other random items), but often you'll stumble upon Drilbur. Either Quick Ball it if you have a stronger Pokémon out, or failing that, swap for a weaker one on standby and weaken the Drilbur down to capture. Train and it will evolve starting at Lv.31, but if you delay it by two levels it will learn Earthquake at Lv.33 instead of at Lv.36 as an Excadrill.
If you want more of a challenge, though, Excadrill is found the same way at Victory Road (Lv.36-37, 39-41). Once you beat the Elite Four and finish the game by toppling Ghetsis, you will also be able to go to Challenger's Cave and Giant Chasm, where they can be found at Lv.47-50. Note that the Pokémon and Trainers here are much higher in level, however, with Trainers boasting Pokémon in the 60s; I recommend getting it sooner.
Good luck getting your own bad-ass. :D