Well, you have to go up the elevator shaft, then beat the two floors by beating all the admin-people and saving Isaac and the Yellow Gem, then shut down all the barriers by beating the three favorites of the bad boss guy and destroying their crystal ball things, then you beat the Blake guy at the top and Darkrai.
Pre-ending: the Altru Building Post-ending: the Altru Tower
it is near altru tower
There is one in the Altru Tower.
after the altru tower mission, he is in almia castle
Gallade is not found in the section of the Altru Corporation known as the Altru Tower, but in the lower section known as the Altru Building. After you defeat the four Dim Sun Admins (on the 9th floor) you will unlock the room which contains the Yellow Gem. This is the room in which two Gallade will appear. However, they will only inhabit that room after you have finished the main plot - ie. once you capture Darkrai.
He is in the Altru Tower (possibly only AFTER Darkrai)
Gengar uses psy power 3 , you can find it in Hippowdon temple,Altru building and Altru tower. Gardevoir uses psy power 3 too , but you can only find one in Altru tower. Mismagius knows it too , you can find it in Almia Castle. I hope I helped! :)
go into the altru tower in the scientists room,there are 2 gallades there
Altru Tower. In the room where the researchers begged you to rescue Isaac, there will be two Gallade.
There are two in the altru tower after beating them while controlled.
Number 77 is Electrode found in the Altru tower.
you can find information on Brighton in the Altru tower in the back. Brighton was the 2nd president.