You'll need to trade for it or migrate it from the GBA Pokemon games into the Pal Park and catch it there.
the answer is no
someone needs to pick a squirtle in soul silver or heart gold and trade it on platinum
go to sendoff spring and use pokeradar
You can't get one in Platinum at all. You'd have to transfer one from FireRed or LeafGreen.
You can only get Squirtle in LGFR.
Migrate it from Leaf Green or Fire Red
You can only obtain squirtle as your starter pokemon( your first pokemon) or through trade.
you can get charmander at sendoff spring and bulbasaur at route 222 but you need the pokeradar for both of them.
On the tv,
no you cant you must migrate from fire red, or leaf green.
You can't. You have to either get them from someone who has one, or get them from fire red or leaf green using pal park.
You can't, you can only get it by trading or migrating