You need to overhead poke Bison with high punch and be careful when you start seeing him walking as it is an indicator of using the "SHADALOO-ISM" psycho crusher. When he crouches it's a good opportunity to overhead poke him and maybe even cancel it into a super combo if possible. Ryu is a more advanced character in Alpha 3, I'd suggest playing with Ken to get an idea of how the game works and to understand its hitboxes. He has easy supers with A-ISM that you can cancel into your regular combos and of course he has busted and easy to do tatsu loops on V-ISM. :) Hope this helps and I will give you a thumbs up for your efforts.

Ah yes, the rumored Arcade History of Final Battle with Shin Dictator Ok I’ll have to break some ground rules here. Remember the Street Fighter Alpha 3 intro when it said “Brave or Grave”? Shin Dictator’s theme is also called “Brave or Grave”. So what this means is: 1) If you fight from the first 9 stages, and lose, you can continue as much as you want. 2) However, get to the final stage, you’ll see the differences: A) There’s a theme within the Final Battle cutscene that indirectly says “Warning: Death Battle incoming. Beat it up guys, try it or die.” Which is a lot like a death knell to the player. Because this isn’t the normal dictator, you’re fighting an overpowered version of him, called “Psycho Dictator”, which means he has Super Psycho Crusher, and an enhanced Heavy Punch to his arsenal; huge disadvantages against you. B) You only have one attempt against him and that’s your first attempt only. Lose, and it’s Game Over, back to square one; since Psycho Dictator won’t give you a second chance against him. It’s basically “Brave or Grave: Win to Live OR Lose to Die.” 3) the Final Boss is as unforgiving as KOF 2002 UM Rugal, except that Rugal is the secret boss there, Dictator is the final boss. His Difficulty Level I think, is level 6-8. All he is, is that he’s cheap, that’s it. If you want to fight with second chances, my best bet is use Street Fighter Alpha 3 Max and challenge him in Arcade Mode. Lose and you can still continue. Do not try Final Battle mode, since that’s a revamp to this Arcade’s Final Battle stage. Otherwise, block his Super Psycho Crusher, or even evade it with a Shoryuken, but don’t let him win, don’t even let him have another chance with the super move. Hope this helps.

Greatest Street Fighter game ever made, period.