The complete Pokemon RBY pokedex, part 10

Pokémon Name: Exeggutor
Type: Grass/Psychic
Classification: Coconut Pokemon
Pokédex Number: 103
Ability: Chlorophyll
Dream World ability: Harvest
Useful Attacks: Egg Bomb
Location Found:
D/P/P/HG/SS: Evolve from Exeggute
B/W: Evolve Exeggute

If you're willing to suffer the recoil damage, Wood Hammer packs quite a wallop. Similarly, Leaf Storm can shred enemy Pokemon but costs you a bit of your special attack stat. On the plus side, Exeggutor's special attack stat is so high it might not matter if it drops for the remainder of the battle.

Evolution: From Exeggute via Leaf Stone