Charizard.
Wyvern
The Wyvern is a highly sought-after massive flying dragon that can overpower most creatures it faces. The deadly Wyvern, which is only tamable by stealing and raising as a baby, can be found in four varieities — Fire, Ice, Lightning, and Poison — each of which have distinct attacks.

Name ideas for your Wyvern from ARK players.
Lightning: Chidori
alduin
Daenerys
Gunther
Zaug
Pyrotek
Went (next in gasbags)
Charizard
Pie-romance (fire)
God
Wyvern
Buttthunder
morrowseer
My fvcking ex
Bjorn
Shawn mendez
Hephaestus for fire wyvern.
Norbert
Fire: Pheonix