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OP here. Just left diglett cave and on my way to battle Olivia. I gotta say those trials were fun and actually challenging. I enjoyed them. I decided to bring back Gumshoe.
For those of you who are arriving to Akala island, I definitely recommend that you do the in-game trade at the Pokemon center at route 5. There's a guy who will give you an adamant Bounsweet for a lilipup.