Grass

Since Generation 6, Grass types are immune to powder moves such as Spore, Sleep Powder and Stun Spore, and Leech Seed never takes hold on them.

Its attacks are super effective against Water, Ground and Rock, and not very effective against Fire, Grass, Poison, Flying, Bug, Dragon and Steel. On defence it takes double damage from Fire, Ice, Poison, Flying and Bug, and resists four types: Water, Electric, Grass and Ground. There are 127 Grass-type species, 47 of them pure Grass; the most common pairings are Grass/Poison (14), Grass/Ghost (10) and Grass/Dark (7). It has 59 moves: 24 physical, 18 special and 17 status.