in my opinion the best secret base spot is the one in the far right hand corner of the desert near the mudslide
i think the best is around route 119 up a waterfall
If you want the biggest and the best, Go directly above rustboro city and use surf. Go all the way until you cannot go any higher then go to the right. There should be two paths, go to the one on the left. You will see a tree, use secret power, ad there you go.
Try the one on Route 120. It is the left indent on the wall north from the most southern log bridge. It is the largest.
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the closest you can be to a gym leader in this game is setting up a secret base with your best Pokemon then mixing records
Other than secret bases the best spot is the Pokemon league.
you evolve a duskull at lvl 37 one of the best ghost Pokemon on emerald
chincypops
The best emulator is NO$GBA