Pokemon Black and White Pokedex - Sandile, Krokorok, Krookodile

Sandile
#057 Unova / #551 National
Type: Ground/Dark
Species classification: Desert Croc Pokemon
Abilities:
Intimidate – Lowers opponents Attack one level; decreases encounter rate with lower-level wild Pokemon
Moxie – Boosts attack by one stage each time user directly KOs an opponent
Dream World ability: Anger Point – Boosts attack stat to maximum level if user receives a critical hit
Location found (Black/White): Route 4, Resort Desert,Relic Castle
Wild hold items: None
Egg groups: Ground
Capture rate: 180
Gender ratio: 50/50
Effort values: 1 Attack
Evolution family: Sandile >Krokorokat level 29 >Krookodileat level 40

Krookodileholds his own in battle. He's especially fun to experiment with because his typing is unique – no other evolutionary family has the Ground/Dark combo. And it's an excellent combo at that, with two immunities, Electric and Psychic, and four good resistances, Rock, Poison, Ghost and Dark (a double resistance toTyrannitarshould indeed be a boon). The downside to his typing is that it does leaveKrookodile vulnerable with five types, but at least he doesn't suffer any double weaknesses

As for moveset, you have a ton of options (again, because of Krookodiles typing), but Earthquake and Crunch are no-brainers for heavy-hitting STAB attacks.