So I found out the most foolproof way on how to tame these guys

Step 1:build a taming trap near a obelisk

Step 2:find an allo kill the one that suits you colors,level etc

Step three: revive it at obelisk in trap remember that

Step 4:make sure it's a stone trap bc they can't damage stone

Step 5:starve it tranq it put soothing balm or not

Step 6:1234 now you have an allosaur!!!

If you found this helpful you don't really need to like I just wanna help I'm gonna tame one like this