I've addressed base Sonic defeating Ultimate Emerl in a couple threads before this one. To my knowledge, Emerl at the time was powered by the seven Chaos Emeralds, making Ultimate Emerl a Super form of sorts for Emerl.
In this light, base Sonic defeating Ultimate Emerl, a being with the power of all seven Chaos Emeralds, especially in the way he did (within 30 seconds) is massively inconsistent with the rest of the series, as it would imply Sonic in his base form has power on the level of Super forms, which makes one question why he ever needs his Super form to deal with beings of such a level. The only way to resolve this outside of simply disregarding it is to take Super Sonic as being stronger than other Super forms for some reason, which would force us to rescale virtually every major character as all of their Super forms are scaled from Super Sonic.
TL;DR: PIS that is inconsistent with how the rest of the series portrays Super forms.