Trapinch cannot be found in Pokémon Black however you could arrange a trade with someone else, you could transfer 1 of your own from a previous game and you could also find a Trapinch within the Dream World.
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Desert Resort, Rebirth Mountain (Credit goes to Serebii)
you evolve vibrava which was evolved from trapinch. you can get trapinch at the desert. trapinch evolves at lvl35 and vibrava evolves at lvl 45.
Trapinch can be found in the dessert in lavaridge town after you beat Flannery.
In the Safari Zone.
Trapinch can be found on route 228 on both Diamond and Pearl using the PokeRadar.