How to have pickachu in starting of Pokemon Go?

A character must simply walk away from them until they disappear, and re-appear on your screen. After you do this several times, Pikachu will appear next to them. This might take some patience, as the game tries to keep the Pokémon on your screen, so don't give up quite easily.

Tap on Pikachu and throw your Poke-ball at him until you've caught him, and hey presto, your first character is the little lightning-bunny. After that, you choose your username  and start playing. 

 

 

SKIP THEM 4-5 TIMES.

THEN CATCH PIKACHU EASILY.