Yutyrannus
Yutyrannus
Possibly the most annoying thing you'll face, Yutyrannus is a very strong creature that deals insane damage due to it being able to deal critical hits up to 200% damage with every attack. The priority is great too, however it won't save you much against things like Clever Girl and Masiakasaurus. A strategy I like to use is starting with Yutyrannus and getting a kill, swapping out to sacrifice something else, and bringing it back in.
When to use: Starter, Mid, Closer
Best Counters:
Clever Girl
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A very good counter to Yuty, this raptor can often one-shot the ones that lack much health. Upper Claw's priority allows her to outspeed Roar.
Masiakasaurus
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Similar to Clever Girl, Masiaka's priority attack allows it to attack Yuty first and lower the attack, allowing you to survive even if you can't one-shot it.
Diplocaulus
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Instant Cunning Strike allows Diplo to lower Yuty's attack, which it can spam to defeat it.
Rativates
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Although not great in common tournaments, Rati has the potential to kill Yuty by dodging after using its Offensive Stance ability.
Conditional Counters
Depending on the omega's level, it may be able to counter this creature.
Australotitan
Olorotitan