Its Pokédex Entry refers to them previously being slaves.
Both of these have a heavy note to HM slaves, Pokémon used simply to learn HMs.
Its previous Pokédex entry refers to it being a thief, which is a common racist stereotype about black people.
It can be seen as a counterpart to Piguson for multiple reasons.
The obvious cultural refence made by both.
They both have a base stat total of 440.
Piguson being a fighting type to counter Vandash's dark typing
Both of their shinies swap race.
For April Fool's Day 2019, Vandash was given a fake alternate form called 'Lawyerdash,' which gave the character purple skin, a dark purple afro, a briefcase, and a dark suit and tie. This made Vandash resemble the "Pool's Closed" avatar from 4chan's notorious Habbo Hotel raids.
For some reason, Vandash's gender icon used to disappear upon capture, but this was fixed in Pokémon Clover Version 1.2.
Vandash resembles a human with black skin. Various other things in its design references many African American stereotypes. Its shoulder area is shaped like a watermelon, referencing the stereotype that black people have an unusually great appetite for watermelons. Its hair is a black afro, referencing how most people with the afro hairstyle are black people. It is also carrying a Poké Ball like a basketball, which is another stereotype of black people. Its shiny sprite is what seems to be a "Caucasian" version with the lips unchanged, referencing blackface.