Budew, the Bud Pokémon. In winter, it keeps its bud closed to survive the cold, but then opens it again in the spring.
– Ash’s Pokedex
Budew is quite cute. It was added as a pre-evolution to Roselia along with the final stage, Roserade, which makes this family unique in that its middle stage came before the first and last stages.
It’s based on a rose bud, and since it’s a baby Pokemon, looks like a baby wrapped in a blanket. According to the anime, the top vines can open up.