Flarevern, Omegadragon & Tiamazus

[Batcop]

Flarevern, Omegadragon and Tiamazus seem to be identically in terms of move set and stats.
Why three of the same kind and is there any real difference?

Got flareven and was wondering cos once a omegadragon killed my flareven after it survived my poison eater attack. (No In the current event though. I know they are buffed and I adjusted my tactics)

[JRAlthouse]

Tiamazus and omegas are practically identical except for a slight stat difference. Omegas looks so much better. The real pro about flarevern is that it is a nice counter monster for the last biter dragaia. But you have to account for its weakness to the vast amount of water types