Easy giga taming tip for mobile players only :

Step 1 : find a giga (recommend to find one on a mountain they spawn near griffin mountain a lot)

Step 2 : because it is really hard to trap it on mountains kill it and take it's implant

Step 3 : go to a obelisk and build a trap around it

Step 4 : get 50 bio toxin

Step 5 : revive and knock him out

There you go

(Bonus tip) - if you don't have enough amber to revive one just get a griffin and tame it while sitting on the griffin