Week 15 is dragon type, which doesn't leave much choice in Gen 1 - we've got Dratini, Dragonair or Dragonite. So I decided to go for the middle child - Dragonair.
I don't quite understand the evolution from Dratini to Dragonite - it starts off kinda looking like a big worm, gets all super graceful and water-snakey... then turns in to a massive dinosaur? Hey-ho. I suppose its Pokemon, it doesn't have to make sense, haha.