Trapinch

Although Trapinch may seem like an inferior Dugtrio, it has a few advantages over the triple mole. Notably, Trapinch has higher Attack, and its low Speed makes it usable in Trick Room. Arena Trap is the main selling point for Trapinch, enabling it to trap the opposing Pokemon while threatening them with STAB Earthquake. Trapinch also, and thankfully, has an immunity to Electric-type attacks, which makes switching in a little easier. The main problem with Trapinch is the fact that it is quite literally unable to take any kind of hit (outside of said Electric attacks). Because of this, Trapinch is very difficult to switch in, and doesn't last very long in battle.