So The Pokemon Revolution Wiki says need completed hoenn dex to start it. Which I don't have done, but I was able to start the quest anyways, I have gotten the seen data for both Latias and Latios. and I went back to the T.V but wasn't able to choose which one I want to catch or receive the Eon Ticket. and that is the point I'm stuck at.

Greetings @Azulfox.

Can you please tell me when did you start the quest?

I started the quest yesterday/day I made the post.

After double checking with other Staff teams, you can indeed start the quest with just the Hoenn membership: however, to progress past a certain point, you will require the full Hoenn pokedex caught data. It would appear you have currently reached that point. To continue the quest, chose your legendary and have a chance to catch it, you will need to complete your Hoenn Pokedex.

Did you have any other question related to that quest?

Ok, thanks for answer.

As there is no further questions, I will now proceed to lock this thread

Don't hesitate to create another one if you meet any issue.
Kind regards,
Caelestya