Pineco

Thanks to a great ability in Sturdy, a great Defense stat, and access to Stealth Rock, Spikes, Toxic Spikes, Rapid Spin, and Explosion, Pineco can function as a great suicide lead, as it can usually ensure that it gets its own entry hazards up while preventing your opponent from setting theirs up. However, Pineco is incredibly one-dimensional. Opponents will easily be able to predict a Pineco lead and act accordingly. Oftentimes, they will be able to set up on it, as it's very passive. It also has a very low Speed stat, meaning it will often be unable to set up multiple entry hazards and then go for Explosion. In addition, your team needs to prevent your opponent from removing Pineco's entry hazards in order to take advantage of them. Thus, a spinblocker and a Defiant user are mandatory, which restricts teambuilding a lot. Lastly, Pineco faces a lot of competition from the faster, stronger, and more versatile Dwebble.