In alpha phase, you must clearly use level rex type dino over 350 with full tek pick up the keys and if you are not solo, be several in tek tier to fight it, you will have a great chance to win if you organize well.
Make sure you bring your best Dino’s. The fight makes you dismount from your pets to pick up key code. BEWARE IF YOU DIE YOUR DINOS WILL BE INSTANTLY KILLED I DID THIS AND I LOST MY ALMOST LEVEL 800 REAPER. Sniff sniff😢😢😢😭😭😭