Timeline of Ridley AI during 4 x-factor opener
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Can follow it at https://milde.no/public/sm/ridley_diagram.png if ya want.

A35B  Some init stuff at the start.
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A377
 |    
A389
 |
A3DF
 |
A455
 |
A478
 |
A354
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B2F3  Accelerates Ridley to a specific coordinate in top left corner
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B321  Choose next AI that Ridley should do.
 |
 |    Would need to jump up to Y=$160 or higher to have a chance of choosing BAB7. Or spin jump to move on to B5C4.
 |    Since we're on the floor, standing still, B6A7 will always be chosen (see full logic below).
 |
B6A7  Pogo startup
 |
 |    Checks if Ridley Y>$120 (meaning Ridley is closer to the floor) and accelerates to $120 if it is.
 |    If it's not, we go to B6DD.
 |
 |    Since B2F3 (see above) already put us at Y<$120, we go to B6DD immediately.
 |
B6DD  Pogo startup 2
 |
 |    Accelerates towards $120 for 32 frames. Since Ridley has an upward momentum at this point, this only serves to
 |    slow the upward momentum down - he will be at Y=$89-ish while still moving slowly upwards after 32f.
 |
 |    After the deacceleration it does some tail AI & sets Ridley's speed for the pogo (4 different speeds at random),
 |    and then moves on to B70E.
 |
B70E  Pogo downwards
 |    1. Attempts to grab Samus (unless Samus is spinjumping or damage boosting, which we are not).
 |       If Samus is grabbed, it moves on to BB8F and returns.
 |    2. Moves the tail downwards and checks if it collides with a block.
 |       If it doesn't, it just returns and does the same next frame too.
 |    3. If Ridley's tail does collides with a block, it sets new "pogo speed" (4 different speeds) and goes on to B7B9.
 |    
 |    At this point in the opener, Ridley's tail is inside the left wall, making the AI go to B7B9 immediately.
 |    If you jump up, you can see the tail has smoke around it, just like when the tail hits the ground in a normal pogo.
 |
B7B9  Pogo upwards
 |    1. If Samus is high up in the room (Y<$160), it will move on to B321.
 |    2. It updates Ridley's speed (deaccelerates) and checks if Ridley is moving downwards or not by now. If he is,
 |       we move on back to B70E.
 |   
 |    At this point in the opener, Ridley is still moving upwards (but deaccelerating) when this AI script is hit first,
 |    so this serves to deaccelerate Ridley into a pogo. This takes around 30f.
 |
B70E  See above. But this time, the tail is not inside the wall, and the next AI change will happen when the tail
 |    collides with the blocks on the ground.
 |
B7B9  See above.
 |    This time in the opener, you should be higher then Y=$160 in the room (jumping up for the 2nd x-factor),
 |    thus the AI will simply move on to B321.
 |
B321  See above. But I'll extend this comment to explain the full logic.
 |   
 |    This routine first sets up an array of 8 AI scripts, and chooses from that array at random. Which array is used is
 |    decided like this:
 |   
 |    1. If Samus is spin jumping, the array contains 8x B5C4 (Hover).
 |    2. If Ridley is dead, the array contains 8x BAB7 (Lunge).
 |    3. If Ridley has less than 14400 health, the array contains 4x B6A7 (Pogo) and 4x B441 (Swoop).
 |    4. If Samus is below Y=$160 (ground level or slightly above), the array contains 8x B6A7 (Pogo).
 |    5. If Samus is NOT spin jumping, grappling or damage boosting, the array contains 6x BAB7 (makes him move upwards)
 |       and 2x B6A7 (Pogo).
 |    6. If she is, the array contains 4x B441 (Swoop) and 4x B6A7 (Pogo).
 |   
 |    At this point in the opener, all you need to do is to make sure you are high enough. That's all. There's no X
 |    coordinates that works better than others, the charging of the 2nd x-factor does not matter, you don't need to
 |    hit a very specific Y area or angle down, just go high enough and you get the 75% chance of BAB7, which is the
 |    desired AI script for pulling off a 3rd x-factor.
 |
BAB7  Lunge
 |   
 |    Does a lot of decisions based on things like whether Ridley is facing Samus, whether Samus is above Ridley, whether
 |    they are closer than 2 blocks from each other, whether Ridley is dead, whether a power bomb just went off etc.
 |    Since you should be above Ridley at this point
 |
B3EC  Sets up a timer (to 0x80) and moves on to B3F8
 |
B3F8  Decrements the counter, and if it's 0, moves on to B321. So we do the following for a maximum of 0x80 frames:
 |    Accelerates Ridley towards top left corner. Once he hits it, move on to B321.
 |   
 |    This movement is what enables us to get in a 3rd x-factor.
 |
B321  See above.
     
      At this point in the opener, we yet again get the 75% chance of BAB7 and 25% chance of B6A7 (re-pogo).
      If we get BAB7, we can pull off a 4th x-factor. If B6A7 he will pogo and we can't.

Chance for getting 3 x-factors: 75%
Chance for getting 4 x-factors: 56.25%