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Give them an ability like "hidden power": Unown sent into battle gets an ancient power boost for every other Unown in the party that isn't fainted or suffers from status. This would do a better job of showing the huge powers that unown are capable of when they are working together.
Before saying this is ridiculously overpowered, note that every unown would still be restricted to only being able to use a single move, and there's a huge amount of strategies that can be used to deal with this team.
