Double Shinku Hadoken

The Double Shinku Hadoken is a team-up move used by Ryu and Ken, which appears only in X-Men vs. Street Fighter and Marvel Super Heroes vs. Street Fighter.

Description
Performed by doing a Variable Combination attack with Ryu and Ken in the same team, one of them prepares a Shinku Hadoken, while the other appears behind him and does the same. They then release a Shinku Hadoken at the same time, inflicting a large amount of damage.

This is the only instance of Ken using the Shinku Hadoken.