In Pokemon Ruby destiny how do you get flash?

You get Flash in Pokemon Ruby Destiny by going to the Devon Corporation and asking for it.

Here's a breakdown:

1. Head to Slateport City. This is where the Devon Corporation is located.

2. Enter the Devon Corporation building. It's a large building with a giant "D" on it.

3. Go inside and speak to the man behind the counter. He'll give you Flash after a short conversation.

Keep in mind that in Pokemon Ruby Destiny, the Flash HM is given to you instead of having to find it in the wild.

Enjoy using Flash to light up dark caves!