PCE Double Dragon II. I got it months ago, and beat it on normal setting, and I just stored in away. Couldn't get any sleep, so I played in hard and beat it. Man, is the last boss cheap. The "best" ending is a motive to actually play it on hard.
Not the best, but a solid beat-em-up for the Duo. I can't think of any other good beat-em-ups on the duo other than Downtown Nekketsu Monogatari (River City Ransom).
In fact, other than Riot Zone - which I'm not impressed with - I don't even know any other beat-em-ups for the PCE/TG.
That crappy one with the women gangs and 50ies pop rock junk soundtrack. I think it was called Ane-San.
Yea I think the Genesis/Megadrive ruled these types of games. I dont think it was lack of power that kept alot more being produced for Pc Engine either. With the Arcade Card they could have made alot of them,or made them on Hu-Cards in large meg size.
I think the only other real beat'em up I like that you didn't mention for Pc-Engine is Vigilante. I did like Double Dragon 2 for Pc-Engine,but I like the arcade game more and in the process enjoy playing the Mega Drive port more. People dump on Riot Zone alot,but I always liked it,and still do. It had the average amount of moves for a beat'em up,and it was fun to play to me,and the graphics were slightly above average considering the sprite size.
People always knock the lack of amount of moves,because Streets of Rage 2 has a ton,but they forget most other games in this genre like TMNT had only the simple button attack combo,a trow,special attack,and a jump attack. Not much more. I don't feel it broke any molds in the genre but I still enjoyed it like other titles like Rival Turf. Not the best,but not the worst. The worst are titles like Ninja Clowns by IT,Battletoads/DoubleDragon,garbage like that.