Same place as you get a Gorgo. And if you don't know were that is it is the Parchment desert [Giganto heads are hard to clean so don't be sad if you fail, I only got 50 on the body and arms and got 53 on the head].
up your but & around the corner
Aro's weakness is probably Fire type attack/large vivasaurs like Giganto.
Igno is a king trye from fossil fighters champino
If you meant Saichan, then Mt. Lavaflow in the regular Fossil Fighters. I'm not sure about Fossil Fighters: Champions.
how to get shoni arms in fossil fighters ds
Areos is best but if you use a miraceous fossil rock it's better. Also Raja and Giganto are great team with Areos. But for legendaries I say Igno is very good with defense and ofense!
in the sea
you buy it at the fossil guild
In bb base
At the BB Base
Rivet Riven
you buy it