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On fossil fighters how do you get to ancient ruins i have tarbo and t-rex all level 12 with other dino suar and beat rosie but all dr diggings says feel like a battle

On fossil fighters how do you get to ancient ruins i have tarbo and t-rex all level 12 with other dino suar and beat rosie but all dr diggings says feel like a battle
You have to have all bones to Tarbo and TRex. I know, I was very dissapointed when I realized that.
Sources:
I have done the same thing