All unknowns are in the seventh sevii island, you just have to look around.
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There are twenty-eight varieties of Unown: A, B, C, D, E, F, G, H, I, J, K, L, M, N, O, P, Q, R, S, T, U, V, W, X, Y, Z, !, and ?.
You have to catch the other 26 Unown first.
Each letter of Unown has its own room, which means that you cant catch all types of Unown in the same room. But you can catch multiple copies of the same Unown in its room.
The tunnel on top the ruins is accessible.The tunnel is where you catch the ? and ! Unown.
If you look carefully in the monean chamber and viapois chamber you can find a secret unown.