That's easy, just start with a Squirtle and evolve it a couple times.
Never in any Pokemon game can you catch a starter but hold on if you migrate a blastoise and charizard from firered or leafgreen to soul silver and then go to the pal park you can catch it.
Sorry, you can't catch Blastoise in the wild. You have to evolve Wartortle. Squirtle evolves into Wartortle at lv. 16 Wartortle evolves into Blastoise at lv.36
blastoise
You Can't Catch blastoise because it is too pro for you you penising noob
Blastoise is only obtainable in firered and leafgreen by choosing squirtle as your starter and leveling it up to 36. Trade a squirtle to emerald then train it to level 16 it will become wartortle then train it to 36 to make it become blastoise.
level 63
blastoise
Poketransfer
wartortle evolves into blastoise in fire red
Articuno, Moltres, Zapdos, Alakazam, Blastoise, Gengar.
catch blastoise at route 566
no.its impossible.you have to transfer.