As a newbie player i started out on the casual and easy mode and I still play it to this day and bc of that when I find Dino's they almost never are over level 10 but if your gonna tame a rex that's that level you need about 5 to 20 narcotic a slingshot with at least 50 to 80 stones some tranq arrows and maybe some darts if you high enough level and just some basic meat if prime or kibble is too hard to get and as a mobile player I would just use regular meat and a tame/mount a flyer preferably and boom your almost 100% sure of getting a rex if this helps please consider putting a thumbs up on the meter and check out my yt channel called rain flower the warrior cat and blind strike the warrior cat thanks and hope this helps out

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