He gets past fanon sonic and shadow, the very weakest version of them. The dragon ball aspect of power scaling made sonic actually weaker. Sonic has grown stronger over time by simply discarding said aspect.
Super sonic and shadow do in fax beat Seelkadoom. The only reason Seelkadoom won was because he had the emeralds on him using them to his advantage the whole fight
Super Sonic was weak that time because he only got the power of master emerald itself and Shadow with the saphire the only reason Sonic can overpower Seelkadoom is because he use the saphire power along with the his master emerald energy Turing him into hyper
No it clearly shows that Seelkadoom was using the emeralds as a power source, and since the power of the emeralds is near unlimited, he was able to stomp Super Sonic and Shadow
Me vs team sonic Strength me Speed team sonic Durability me Iq me Battle iq me Experience me Battle Experience team sonic Stamina me Agility team sonic Combat me Combat speed team sonic Combat experience team sonic Overall Strenght me Overall iq team sonic Power me Force me Raw power me Punches me Kicks me Spindash team sonic Size me Height me Weight me Length me Bite force me Claws me Forms team sonic Abilities team sonic Tech me Planning me Skills me Barbed tail me Climbing team sonic Climbing speed team sonic Vision me Tactics team sonic Scent me Hearing me Listening me Battle skills me Winner? Me mid-high difficulty