>>50972219Ignore the reddit replies
the true reason is that Blastoise never been good in the games after Gen1.
90s kids thoughts "WOW CANNONS = HE CAN DESTROY EVERYTHING XD" but they grew up and started to understand stats and they realized Blastoise was shit.
7 gens later and Blastoise never been good and the anime stopped shilling the line for a very long time while Bulbasaur kept being shilled in the anime and Venusaur earned its respect alone by how it kept being among the best pokemon in pvp in every gen.
Notice how Blastoise fans don't even get involve in Kanto starter wars because they know Blastoise stands no chance in any ground.
it's surpassed by other water pokemon in Kanto and it's the worst Kanto starter in meta.
all these things made Blastoise fade became less popular.