The complete Pokemon RBY pokedex, part 10

Pokémon Name: Exeggute
Type: Grass/Psychic
Classification: Egg Pokemon
Pokédex Number: 102
Ability: Chlorophyll
Dream World ability: Harvest
Useful Attacks: Sleep Powder
Location Found:
D/P/P: Great Marsh (requires National Dex)
HG/SS: Use Headbutt on trees; Pokewalker - Big Forest
B/W: Route 18 (swarm)

This strange looking creature mixes some of the better attacks from both Grass and Psychic types, including Leech Seed, Solarbeam and Psychic. Evolution requires a Leaf Stone.

Evolution: To Exeggutor via Leaf Stone