To scape wyverns ,180% movement speed will do just fine ,if you want to leave them super far behind ,get 190% or 200% argy.If you are trying to knock them out solo,it is best to build a wyverns cage ,which you can trap them in and easily knock them out
If your playing by yourself or very few people all you need is a argy pumped with health, stam and melee and argy has tighter turn radius so you can fight wyverns without worrying about special attacks but in group stay in middle. Like so people can see
The best way to level up a Giga on Rag is to get a bunch of wyverns to follow you on your griffin/ptera, then dismount you’re flyer above the Giga, then get on your Giga and absolutely destroy them. This got my Giga 26 levels from 3 wyverns.