Where to get fusion available for karn in breath of fire?

Answer 1

~ Shin: In Gant. In the largest house at the top, you'll find a hole in the wall badly disguised by a drawer. Shove it aside and you'll find a mentor on the other side.

~ Debo: In Gust. Inside the flutemaker's house, look where the two barrels and the box is. Move aside the box to fall down the hole, and then solve the barrel puzzle to get to the other side.

~ Doof: From Camelon, head north-east across the two bridges. Instead of going down the ramp to the where Nanai was, head up to the dig patch and use Mogu on it.

~ Puka: In Bleak. In the house behind the Dragon Shrine, there are two big boxes that can be moved by Doof. One houses the item, but if you move the top stack of boxes, you'll fall down a hole where the mentor is.

Hope this helped!

Answer 2

In "Breath of Fire," Karn's fusion ability becomes available after unlocking the ability to fuse with Gobi. To do this, you have to recruit both Gobi and Mote into your party and then talk to Mote in the Shamans' town. This will trigger a series of events that eventually unlock the fusion ability for Karn.