What switch do you push first in Pokemon crystal version?

You can't push a switch in Pokemon Crystal version right at the beginning of the game!

When you start the game, you're in your bedroom. The first thing you need to do is talk to your mom and then leave your house. You'll then encounter Professor Elm, who gives you your first Pokemon.

There are many switches in Pokemon Crystal, and they're important for solving puzzles and unlocking new areas. But you'll need to progress a bit further into the game before you encounter them.