What 2player ps2 games are out there like - Gauntlet legends - contra - double dragon - final fight - dynamite cop - golden axe can be 3d or 2d, just a good game where you run around or across the screen and fight bosses or get powerups
Panzer Bandits Alien Soldier Gunstar Heroes Zombie Revenge Streets of Rage series There's heaps and heaps those are just off the top of my head. Edit: Oh yeah, damn, I just read the subject header and skimmed the rest. dumb dumb. It's because he listed non PS2 games I think.
He asked for games for ps2... some of those are not (I think at least? Pretty sure zombi revenge i dreamcast only anyways). The Bouncer is half decent and for ps2 though Also make sure to get the Sega ages Dynamite Deka game. It was awesome for saturn anyways http://www.play-asia.com/paOS-13-71-r-49-en-15-dynamite-70-16ss.html
There was a Treasure collection released for PS2 recently, that'd certainly be worth picking up. Might want to look at Alien Hominid too.
There's also all of those licensed IPs like the Teenage Mutant Ninja Turtles games, Batman: Rise of Sin Tzu, and the Lord of the Rings: The Return of the King. I don't know how good they all are, but they're co-op beat'em up games.
Didn't even notice, to be honest. Once I saw Contra in the list I figured he was after side scrolling action games...
I think what he wants predominately is two player beat'emups/sidescrollers. I think I'd included the Dynasty Warrior series (except 1 and 2 but only because 2 is bad).
Just stay away of stuff like Beat Down: Fists of Vengeance, Final Fight: Streetwise and Urban Reign. My suggestions? The Warriors (like Phinn already said), Viewtiful Joe, Onimusha: Dawn of Dreams