|Roggenrola||Lv. 16 ~ 18||34%|
|Woobat||/||Lv. 16 ~ 18||31%|
|Timburr||Lv. 17 ~ 18||20%|
|Shaking Grass / Swirling Dust||Level(s)||Rarity|
|Drilbur||Lv. 16 ~ 19||80%|
The replacement to the ubiquitous Geodude in other regions, Roggenrola is a pure Rock-type Pokemon, meaning its weaknesses to Water- and Grass-type attacks aren't as severe. As you'll probably learn in a frustrating fashion, it has the Sturdy ability, which prevents one-hit knock out moves, but also ensures it hangs in there with 1 HP left if it would be KO'd by an attack while at full health.
Are you able to trade with your Black or White version? If you answered yes, good, then definitely consider Roggenrola; otherwise, it'll be stuck as a Boldore, since it evolves through trading, and let's face it, Gigalith is where it's at. Gigalith has ridiculously high Attack and Defense, making it very tough to take down using Physical-based attacks. It's slow as can be, though, so it's going to wind up taking hits, but thankfully dealing plenty of damage in return.
Its moves are rather lackluster as it levels up; Rock Blast will be its only real choice for powerful Rock-type attack until it learns Rock Slide at level 30, and then Stone Edge at level 48. It really learns very little in the way of worthwhile attacking moves, forcing you to use TM moves on it instead. TMs to consider before beating the game are, uh, Return, Rock Smash, maybe Facade, and... Bulldoze. It doesn't even get Dig, and since you don't get Earthquake for awhile, it's rather frustrating.
Gigalith makes for a strong Pokemon, but it is just very limited in its diversity and is very slow, meaning your opponent will almost always get a hit in on it. I mixed on recommending it, so use it if you feel you want something like that.
The Psychic/Flying-type Woobat may look charming, but it's stats are really anything but. It evolves into Swoobat when its happiness is high and you level it up (this is easy to raise by riding around on the Bicycle for 15 mins or so), but, aside from some impressive Speed, its stats are really pitiful.
The only reason you would want to use Woobat over other options, like Zubat, Sigilyph, Gothita, or Solosis is simply the fact that it employs a rather fun strategy. The trick to making it work is to use Attract right off the bat (no pun intended) to hopefully stop the foe from attacking, then strike with its signature Heart Stamp or Air Slash — both of which have a 30% chance of inflicting flinch. Swoobat can work fairly well in that regard, although it's risky and will only work against Pokemon of the opposite gender (well, at least the Attract part). It can make use of some other attacks, can set up Light Screen + Reflect, and can affect the foe with paralysis using Thunder Wave to intensify the problem, but, like I said, its stats ultimately hold it back from the potential many other Pokemon have.
I don't recommend it, but, assuming you are creative with its strategies, it can actually be pretty fun to use, which is way better than being totally worthless.
Timburr is a lot like Roggenrola, except it is a Fighting-type instead. This means it has ridiculous Attack power and also lacks reliable moves for awhile. It comes with Rock Throw and Low Kick, but picks up Wake-Up Slap fairly soon at level 20. That's its only reliable Fighting-type attack until level 45 (as a Gurdurr or Conkeldurr), though (don't get me started on DynamicPunch), when it learns Hammer Arm. There's not even the Brick Break TM available early on for you to look forward to, so you're stuck with Wake-Up Slap for most of the game, or Low Kick for heavier Pokemon (if you want).
It does get Rock Slide and Stone Edge, though, so that's nice, and Bulk Up can be huge for it. You're really going to have to put some TM moves on it. Even though I said I wouldn't talk about it, it learns some amazing moves at the first Move Tutor in Driftveil City; we're talking Fire Punch, Ice Punch, and ThunderPunch. Those are just too good not to miss out.
If you can trade to evolve it and are willing to invest Red Shards into learning some of the elemental punches, Conkeldurr will be pretty nice (remember, you have to trade Gurdurr to evolve it). Otherwise, don't expect too much out of it, other than hitting hard albeit slow with underwhelming Fighting-type attacks.
Onix is not quite the defensive powerhouse it once was. Its Defense is sky-high, sure, but it is taken out so easily by Water- or Grass-type attacks, as well as a host of other types, not to mention its attacking stats and HP are just pitiful. It evolves into Steelix when you trade it while it holds the Metal Coat, which you get much later in the game. Fully evolved, its Defense is astronomical and it even gains ok Attack (though still leaving much to be desired).
Its moved have changed quite a bit in Black 2 and White 2; it now gets Curse really early on, which would be great... except for the fact it's too early, meaning you'll have to wait until you get to the Pokemon World Tournament's Reminder Girl before you can relearn it. It can set up Stealth Rock for those longer fights, but honestly its moves really are not too incredible and don't give you a lot of combos. If it got Curse a little later, so it wasn't pushed back, then it'd be ok, but as it is now, it's not so good. Even post-evolution, you're better off looking at a monster like Excadrill as opposed to a rusty old snake who doesn't even get Earthquake naturally. I don't recommend Onix in this game, sorry.
Drilbur should start with Metal Claw, but it picks up Dig at level 19, which should be before you get the TM for it. That'll be its main attack for awhile, although it does get Slash at level 26 and Rock Slide at level 29, too. If you hold off evolving into Excadrill until level 33 (just two levels), you'll pick up Earthquake at that level instead of level 36 as an Excadrill, but wow, once you've got an Excadrill with Earthquake, you're so set. It's such a powerful attack! As if that weren't enough, it gets Swords Dance naturally at level 36 to raise its Attack through the roof, and it even picks up Drill Run at level 43, which may be a good move to keep around for single-target attacks (there are more Double and Triple Battles nowadays). It can also learn good TM moves like X-Scissor, Aerial Ace, and Shadow Claw before beating the game, which is great.
I've definitely gotta recommend Drilbur. You'll have to baby it for a little while (thankfully not as badly as in the original Black and White), but once you've got it up to level 31 (or 33 if you're patient), you'll have a nimble, stupidly powerful monster called Excadrill tearing everything apart.
There are a few directions you can go in here, so start off by heading over to the right, then up and around so you can walk down the steps. Have your Dowsing MCHN on and you can find a hidden Escape Rope due south, while there is a Researcher to the north who uses a Venipede L17 and a Koffing L17. Just past her is a Hard Stone, which is a held item that boosts the power of the Pokemon's Rock-type attacks by 20%.
Now go back to the start and head north, west, and north so you're against the cliff. There's an Escape Rope up there, although this one is not hidden. Just south of there, or to the west of the start, there's a Scientist who uses a Grimer L18. Past him is a Backpacker with a Herdier L18, so be careful, because it can hit surprisingly hard (and likes to use Work Up).
Unfortunately, that just leads to a dead-end, so that's all there is to do here for now; you get access to the places up on the ledge later on in the game.