Question

Someone says I need to upgrade it with the EXPN Card what in the world is that?!
also do I need to fix the power plant???

Answer 1

Use my old answer.
Here
Hope this helps.
Yus, fix the Power Plant
The location is here:
You can find that Part in the Cerulean Gym. You have a square in the middle of the gym (it exists of four Surfing steps). You can find that Part if you press the A - button on the left upper tile standing left to that tile with your face in the direction of that tile (compare it with taking a PokéBall with an item in it).

Comments

The Snorlax is holding leftovers, so it's very helpful if you catch it.

Answer 2

After returning the generator part to the power plant, go to the radio tower in Lavander town, talk to the guy in the brown suit and he'll give you the EXPN card.