You'll need to migrate it from the Gameboy Advance games to the Pal Park or trade for it.
yes you can but you have to cheat with the action replay
Squritle is not one of the starter Pokemon in those games, but you can catch it after you get the National Pokedex.
Vermillion city (after beating the gym leader)
Charmander, Squritle, Bulbasaur
You pick it at the beginning of the game.
You can find Pidey in a Pokemon Outbreak in Pokemon Diamond
you have to sprinkle it with the squritle bottle
talk to him and you get a free charmander, bulbasaur, or squritle and i think there a pretty good level to star at
where do i find a totodile in Pokemon diamond/pearl on nintendods
You can not find or get manaphy on Pokemon diamond but you can by hacking, trading or... if you have Pokemon ranger you have to complete the manaphy mission and then you can put it onto diamond.
Yes, There is Turtwig Grotle Torrterra Blastoise Warturtle Squritle
You can't find a Ho-ho in Pokemon Diamond. You have to migrate.