I wanted to know if when I choose a region, will it mean that I can only catch those Pokemon, like if I catch Alola I will only be able to catch Alola Pokemon etc, what changes with my choice?

Hello there! The main storyline of PRO consists of four different regions which you will get the opportunity to explore:
 

• Kanto Region
• Johto Region
• Hoenn Region
• Sinnoh Region

When playing through the story for the first time, you will have to travel to each region in the order that I listed above. After you become the champion of all of the regions, you will be free to roam about any of them. This also means that you will get the opportunity to catch any of the Pokémon that spawn in those regions at some point or another. If you would like to see where a specific Pokémon can spawn, I recommend joining the Official PRO Discord. Once joined, you can go to the #bot-commands channel and use the /spawns command using the Reborn Bot which will give you information on where a specific Pokémon can spawn or, similarly, information on which Pokémon can spawn in a certain area. 

I hope this information was helpful to you. In the event you have any more questions or concerns, please feel free to reach out!

 

- Codexed