Fast way for rank12.
The fastest way to get your vivosaur is if you have beaten the game, you 've gotten all the time machine parts, and you hav frigi. First if you have 21-50 use frigi, orno and guan. Beat dynal. Then make sure you have a rank12 perso. Put perso in the front, and the other 4 in the ez and sz. Face guhnash and keep doing that until all your vivisaurs are rank twelve.
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