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.
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Unown is pokémon number 114 in the Sinnoh (Pearl/Diamond/Platinum) pokédex.
In Diamond/Pearl/Platinum, after you have caught all the Unown the Maniac Tunnel on Route 214 will be fully accessible, now you can catch the "?" and "!" Unown.
unown
unown
it depends on which game it is. on diamond peral and platinum its in the solocean ruins