User blog comment:Zeref Fullbuster/Tri Megas/@comment-27158424-20160117180009/@comment-5600444-20160118170022

Vikemon is only one of Gomamon's Mega forms. SkullGreymon and MetalGreymon are both Ultimate forms of Agumon, but Metalgreymon just was the form Agumon was meant to Digivolve as Tai's partner.