Hello, I'm an expert in the field of Pokémon, a popular media franchise that includes video games, trading cards, and an animated series. When it comes to the evolution of Pokémon like Squirtle and Bulbasaur, it's important to understand the mechanics of the game and the nature of the Pokémon themselves.

In the Pokémon games, Squirtle evolves into Wartortle at level 16 and then into Blastoise starting at level 36. Bulbasaur evolves into Ivysaur at level 16 and then into Venusaur starting at level 32. The term "ash" typically refers to the color of a Pokémon, not a type of evolution. However, if you're referring to a specific Pokémon from the animated series, such as Ash's Squirtle or Bulbasaur, their evolution can depend on the storyline of the show or the decisions made by the character Ash Ketchum.

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Ash originally wanted a Squirtle to be his starter Pok��mon, but Professor Oak told him it was taken by a Trainer who was not late. Squirtle is the only member of Ash's original team of six (Pikachu, Butterfree, Pidgeot, Bulbasaur, Charizard, and itself) that has neither evolved nor ever explicitly refused to evolve.read more >>