I have googled for this, but can't really put the proper terms to find an answer.
At the initial release of Pokémon Go, how many Pokémon were available? I seem to remember legendaries like Mew and Mewtwo were not, at least, but I can't confirm this.
Best Answer
Yes, there were no Mew / Mewtwo, or any other Legendary Pokémon, and Ditto weren't available (so there were only 145 Pokémons): Here's list of the Pokémons that were available at launch.