Have 3 of them and ride the one with the alpha boost and you will be unstoppable. You can take on rex and spino and even alpha raptor or carno. I would recommend them if you are still level 50 below on mobile and have a tannery if not get the Baryonx and have 2 of them following you.
The Allosaurus is a pack-hunting theropod that's smaller but faster than Rex. When in packs of 3 or more, the highest level Allosaurus will become the pack leader, emitting a red aura and making it stronger in battle.~Steel Cookie 123
If you really think about it, these are SOOO underrated. Incredibly high damage and speed. A pack of 10 is easily better than a Giga. 3-4 ballista bolts, (lvl 29 btw) can make a Giga rage, and ballista bolts have a VERY long range, so... you’re dead if you’re riding it. Against a level 30 player. You see 10 Allos coming for you? Run for your ballista? 3-4 Allos dead, still 7 Allos killing you. Even rockets against 10 or so Allos? Crap. You’re still dead. They are so fast and can 20 shot ANY creature in the game if it’s an alpha. Yes, Titantos? Dead in 20 shots. (5% of the creatures health over time.) (Doesn’t work on bosses.) Compared to a Rex, an alpha Allo is arguably equal. Base stats of the Rex are 1100 health and 62 damage. Alpha Allo is 787.5 health and 52.5 damage. They have much faster DPS than Rexes and have better stamina, allowing for more overall damage. Not as much health, but still. To a wild Giga (level 1) with the alpha attack they deal 4000 damage. 4000!!!!!!!!!!