Ok, after looking back at these people....yea this task is harder then I thought.

More so which one would be the easiest to talk out of their villainy.

To define "Talk No Jutsu" the following means:

To use empathy, understanding, and reason to convince a person (usually a villain) to reflect on their actions and change their ways.

So is anyone going to talk about who they chose and why? No? Ok....this is anti-climactic.

I'd say Rose would be the easiest. Explaining why his plan is brain dead would beating a dead horse. But I'd just tell him that:

1. There is an electric type Regi that can power all of Galar in the Crown Tundra and that his brother in looking for it.

2. It's not worth putting people in danger over something that'll happen a thousand years later. Even then, at the very least evacuate all of Galar before you start Armageddon!!!