Delphox doesn't have anything that can do massive damage against pure water types, so that massive pwnage move doesn't exist. You can look at Calem's team here.
For dealing with Delphox, you can cruise past the game if you over level. If you're playing with a level limit, then try and get a faster water type, or Mega-evolve Blaistoise.
As for breeding the other starters apart from your own, you can't until you've beaten the game (Shauna will give you the remaining starter, in your case Froakie), or you need to trade with someone.
Also don't ask side questions; ask them in a new question.