The new Pokémon Crocs design showcases beloved evolved starters; Charizard's fiery aesthetic on one clog, with orange accents and flame patterns decorating the black base, and Blastoise's water ...

The spawn rate for shinies during Community Day is somewhere between 3-5%, in other words, 1 in 20 or 1 in ~35 Squirtle catches should get you a shiny one you can evolve into a Blastoise.