Venusaur

Venusaur boasts a good typing that grants it useful resistances to Water, Fairy, Grass, Fighting, and Electric, as well as an immunity to Toxic and powder moves plus the ability to absorb Toxic Spikes. It also has high Special Attack and powerful STAB moves in Leaf Storm and Sludge Bomb that prove to be very troublesome to a large majority of slower Pokemon, giving it amazing wallbreaking potential. Venusaur's Speed tier lets it outspeed most other wallbreakers as well, such as Exploud, Emboar, and Magneton. All of these traits give Venusaur great offensive and defensive presence. If that weren't enough, Venusaur can also be a potent Chlorophyll sweeper, using its bulk to set up Growths and overwhelm foes with +2 Giga Drains. However, Venusaur has several common weaknesses in Fire, Psychic, Flying, and Ice, of which many users outspeed Venusaur. Despite that, Venusaur has relatively minor flaws when its stats, typing, and movepool complement it so well.