Bulbasaur is one of the starter pokémons, and it is always at least at level 5.
This is a normal bulbasaur:
It also is a shiny version:
Pokédex Entry: For some time after its birth, it grows by gaining nourishment from the seed on its back.
Biome found: Forest
Evolutions: Ivysaur (Level 16), Venusaur (Level 32)