Trapinch is an orange, insectoid Pokémon. It has a round body with a white underside and four stumpy legs. It also has a proportionally large head, small black eyes with twinkle-shaped pupils, and a zigzagging mouth.
Trapinch's large jaws are powerful enough to crush any boulders that get in its way as it digs through the sand of the arid deserts in which it lives. It can go a week without water. Instead of actively hunting prey, it digs into the sand to build its bowl- or cone-shaped nests, waiting for prey to tumble inside and become trapped. When night falls, Trapinch will dig itself a spot underneath the sand and go to sleep. Due to the size of its head in contrast to its small body, Trapinch will be unable to get up after flipping over onto its back, making it vulnerable to natural predators such as Sandile.
Trapinch's base Attack stat is higher than that of its evolved form and is the same as that of its final evolved form. That may be a reference to the fact that antlion larvae are more aggressive and predatory than their adult stages.
It also has the highest base Attack stat of all Pokémon that can evolve twice.
Because of this, evolving a Trapinch in Pokémon GO will result in its CP going down, a trait otherwise only seen in cocoon Pokémon such as Kakuna.