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So Cyan Beach does tell you that the recommended RP for your team be >2500.
I suppose the current strategy goes along the lines of staying on Greengrass until:
>You have a team that meets the RP suggestion
>You have a good array of berry specialists for each berry type, preferably 2 berry specialists per type
And staying away from Cyan Beach if you're attempting to raise lower level pokemon. The reduced dex size can be a positive if you're aiming for a specific pokemon/sleep style.