how do you get pikachu as a starter on pokemon emerald

[Psyduck]

how do you get pikachu as a starter on pokemon emerald?

[Zidarose]

There is no direct way, in-game, to have Pikachu as your starter Pokemon. The best one could do is trade it into the game and use it instead. You could then have been evil and chosen Treecko, so the Pikachu is fighting the Torchic.