The following strat was performed using Noob Saibot, but I believe it will work with anyone with a "long range uppercut".. e.g. Jade.
- Start: Hold block and tap down repeatedly until she comes over
- Kronika should do either an air-ball or a bubble attack, counter with an uppercut
- If Kronika teleports over to you quickly go to 1 otherwise do a single jump movement towards her with no attack and then go to 1
Additional notes:
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The reason for tapping down while holding block is it seems to reduce the chance of her specifically doing the pattern of "wait and then Blue splash attack". If she does do it, she should do it quickly which will mean you will easily block it. Taking this pattern out of the equation makes counter uppercutting in step 2 much easier and much more consistent.
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During the 3rd phase of her boss fight she may slip in a "time beam ball" instead of the usual "4 shot air ball". You need to be ready for it. You can tell its one of those if the 4 shots don't come out immediately. When this happens do repeat jump kicks towards her while trying to time them so you're in the air when the beam comes flying through. Alternatively, if you have enough HP to take the damage you can hold crouch and block.
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Also during the 3rd phase she's going to throw rocks instead of doing the ball/bubble very often. You want to time your uppercuts slightly earlier to hit her without taking damage, however if you've done everything right before phase 3 you should have way more health than her which means you can trade hits safely with uppercuts vs rocks (both get hit at the same time). Often she goes into a rock throwing loops and you can progress the fight really quick by trading during these moments provided u entered phase 3 with at least around 50% hp.
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It may be possible to use some sort of combo instead of using uppercut. Unfortunately since a lot of moves have their special properties negated against Kronika, a lot of them don't do much damage. Most often an uppercut is just better. There may be something better out there though, feel free to experiment.
Example (taken from my 20:22 PB):
