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You cannot get Mewtwo as a starter Pokemon. The only starter Pokemon available are Charmander, Squirtle, and Bulbasaur. There is no other way to get another starter Pokemon. Mewtwo can only be obtained at the end of the game.
Torchic is a fire type of Pokemon. The only way to get one of them in Pokemon Pearl version is to trade it.
You don't. The only way to get Charizard on Pokemon Pearl is to migrate one from the Kanto Reigion.
You can't catch Murkrow in Pearl. Murkrow is a Diamond-only Pokemon. Just like Misdreavus is a Pearl-only Pokemon.
The best way is to get some codes online. Using an online forum is a great way to do this.