Is there a cheat to max relationships in sims 2 castaway psp?

yes there is, just google it.

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^-- an idiot.

What if everyone on every forum just said that. Then google wouldn't be so fcking helpful, yea? Here's an actual answer.

[Square], [Triangle], [Right Trigger], [Down], [Down], [Up] - All Craft and Resources

[X], [Right Trigger], [X], [Right Trigger], [X] - All Plans

[Square], [Square], [Square], [Square], [Left Trigger] - Max current Food and Resources

[Left Trigger], [Right Trigger], [Up], [X], [Right Trigger] - Unlocks Knome

[R2], [Dpad Up[, [X], [Square], [L1] - Fill All Motives

[Dpad Left], [Dpad Right], [Square], [R2], [Square] - Max Current Inventory

[L1], [Dpad Up], [R2], [Dpad Left], [Triangle] - Max Relationships

[Triangle], [L1], [L1], [Dpad Left], [Triangle] - Set Skills

You have to modify your psp to get the [R2] button.