Snivy

Snivy
Unovadex #001
Nationaldex #495
Type: Grass
Species: Grass Snake Pokémon
Ability: Overgrow/ Contrary (Hidden Ability)
Evolution: Servine (lv. 17) Serperior (lv. 36)
Exp. at lv. 100: 1,059,860
Height: 0.6m
Weight: 8.1kg
Catch Rate: 5.9% (Note: this Pokémon, at this time, is unavailable in the wild.)
Gender Ratio: 88% Male, 13% Female (Exact number: 87.5% Male, 12.5% Female)
Egg Group: Field/Grass
EVs Yielded: 1speed
Obtainable: Beginning of the game (Starter), Breeding, Event (Pokémon Center, now over, no more scheduled events at this time.)
Weaknesses: Fire (x2)
Flying (x2)
Poison (x2)
Bug (x2)
Ice (x2)
Moves:
Tackle: Base

Leer: Level 4
Vine Whip: Level 7
Wrap: Level 10
Growth: Level 13
Leaf Tornado: Level 16
Leech Seed: Level 19
Mega Drain: Level 22
Slam: Level 25
Leaf Blade: Level 28
Coil: Level 31
Giga Drain: Level 34
Wring Out: Level 37
Gastro Acid: Level 40
Leaf Storm: Level 43
Grass Pledge: Tutor (Driftveil City)
Strategy: My favourite moveset for Snivy is Leech Seed, Leaf Storm, Coil or Leaf Blade, Subsitute (TM only). Obviously you're going to want to evolve Snivy before you try any competitive battles, but keeping Snivy from evolving until later does let it learn moves faster. Snivy does have speed on its side, so only a few EVs should be invested in speed. I'd say put some in special attack because of Leaf Storm, but you may want to delete Coil for Leaf Blade, to avoid lowering your stats too much in battle.