That large island on route 125 is the best secret base location.
(it's that island one always lands on when flying to route 125)
Not sure what constitutes as a "good" or "best" secret base location tbh, I was always picky in terms of the interior design on top of setting. So Route 120 has been my go-to Secret Base location since the original Ruby because it looks so serene. I always loved seeing the clouds go by in the lake, and of course the ability to grow berries right out front.
I was disappointed that the bush and berry soil shrunk in
ORAS, though, but I didn't want to leave the area so I scouted around and decided to have it in the tree above Registeel's ruins instead. I have to walk over for the berries, but I think I also chose it because of the base description making it sound mystical:
"A Secret Base above a tree where the unusual aura from nearby mysterious ruins hangs thick in the air."
Honestly forgot about it since it's been... fuck, it's been
years since I last played it. Not sure what possessed me to get to JWittz' secret base to recruit him, though. Again, forgot you could do that by posting your QR code. I can't even remember who the other two in the base are, either, think I got them from Serebii signatures.
I think I'd have played
ORAS more if something about it didn't disappointment me during gameplay that once I was done, I was
done. Like I always felt like it was missing something and I just don't know what, or can't remember what it was that bugged me about it, and that makes me sad. Hoenn's not my favorite region, but I hold the most fond memories of Pokémon games though it, so I guess I had a lot of high expectations for the remake to have been as good or
better than how
HGSS did it.