The complete Pokemon RBY pokedex, part 1

Pokémon Name: Wartortle
Type: Water
Classification: Turtle Pokemon
Pokédex Number: 008
Ability: Torrent – Increases power of Water-type moves by 1.5 if Pokemon has less than 1/3 HP remaining
Dream World ability: Rain Dish – User recovers 1/16 HP each turn during rain
Useful Attacks: Aqua Tail
Location Found:
D/P/P: Kanto starter - transfer from FireRed or LeafGreen, evolve from Squirtle
HG/SS: Evolve from Squirtle
B/W: Poke Transfer, Evolve from Squirtle

The tiny Squirtle grows a pair of fangs to become Wartortle, a formidable foe said to live 10,000 years. We're not sure how such information came into being, but hey, that's what the game says. Wartortle does have the highest defense of all the second-stage starters, so less aggressive players might decide to take this route. As with all middle starters, this is more of a pit stop on the way to a superstar Pokemon, so let's move along, shall we?

Evolution: From Squirtle at 16, to Blastoise at 36