A giga destroyed your base ? Sad. Do you want revenge? You just need a 300 lvl rhino, If you spam health on it , it has a chance to beat a giga. On mobile, they can turn a wild giga to a smashed bacon with spyglass trick
If you are on a pvp server(pve works as well), and you're raiding someone, try to use the rhino's charge attack. If your opponent has a rex, and you hit it with a full charge meter, it will be an instakill.
The wooly rhino is a great tame I got a 150 perfect tame and just used it in a raid and it took down 3 Rex's and with the help of another rhino we took down a giga really recommend this dino
Get a male and a female rhino breed them until you get around 500+ melee damage, with 100% imprint it almost always rages gigas with one full charged attack.