Surprising as it might sound, Meteor Falls is also a good place to train (especially Water types).
Especially in the higher levels, where you can find Dragon Tamer Nicolas. I would also suggest Trainers' Eyes coupled with Exp. Share.
Example for Meteor Falls, using a Water-type (Wailmer).
The Pokemon available are basically Rock and Poison types (Lunatone, Solrock, Zubat, Golbat, etc.) Water is super-effective against Rock anyways, and Poison doesn't do well against Water either!
Plus, it's not too far from Fallarbor Town. I'd suggest using Fly once you exit however.
In the same way, Fiery Path is also a good place to train. That Strength-needed area offers some pretty good level Fire/Ground/Poison types. (Torkoal, Numel, Slugma, Koffing, Grimer) They're normally around Lv. 20-25 back in there, which can be really good for Pokemon.
I'd suggest to the west and east of Fortree as well. The long grass has a lot of powerful Pokemon (trust me, it was hard enough to get through...) like Tropius and Linoone, all around Lv. 30. Also, if you're lucky, you can see Absol there, which is enough said in my opinion.
Just some suggestions, and I hope this helps!
AEPMT
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