What types of unown are there in Pokemon Platinum?

Answer 1

There is only one place in the entire game in which you can find unknown. You can find them in the solaceon ruins to the right of solaceon town. The types of unknown on the other hand have remained the same: ABCDEFGHIJKLMNOPQRSTUVWXYZ!?

Answer 2

There are 28 forms of unown. There are 26 forms for each letter in the alphabet, an exclamation mark (!), and a question mark (?).

In route 214 there is a cave with a ruin maniac. Talk to him and he will propose a race to see if you can catch the unown after he digs the wall. Now go and catch unow from A to Z.

The first 26 (A - Z) Appear in the Solaceon Ruins after you get to the room where you get HM05 - Defog.

There is none in the entrance room and in the four rooms you pass and the basement you will find F, R, I, E, N, D respectively. The other letters are in all the other rooms.

For the last two forms (? and !) you have to catch each one of the 26 and go to the cave in Route 214 where the ruin maniac is and long tunnel with a doorway will be there. Enter it and there the other two unown will appear. If they don't appear the first time you enter the room then get out trough the south exit grab the rare candy and get inside again.