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In contrast, bulbasaur is weak to all the birds and bugs that are so common in the early game.
To make it more difficult, Bulbasaur is the only one of the three starters to not learn a STAB move as their first move after the debuff at 5.
Squirtle gets bubble, ember for Charmander. Leech seed for Bulbasaur. And while leech seed has uses late game when you’re tanky, it is mostly useless against wild pokémon.
That is to say, both Charmander and Bulbasaur have a lot of trouble early game until you get a diverse team. But Squirtle will just stomp through it all (especially in original Gen1 when Special was imba, combined with its natural high defence state).