IQ in Terroh works exactly the same as in Pokémon Mystery Dungeon. Here is the article about it: http://bulbapedia.bulbagarden.net/wiki/IQ
However, IQ evolutions work differently. Please refer to the "Different Evolution Methods" post in this thread.
When a wild Pokémon is encountered, there is a chance that the Pokémon already has IQ points. Generally, the higher level of the wild Pokémon, the higher the IQ will be.
IQ Skills are used in Terroh. There are 10 IQ groups that learn different skills at different levels. Refer to the article linked above for information. 
Unlike in Pokémon Mystery Dungeon, the different members of the same species of Pokémon may belong in different IQ groups. Their IQ information will be detailed when a Wild Pokémon is encountered.

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Last Edited By: JDLJDL Apr 10 11 12:08 AM. Edited 2 times.