I know that function does not currently exist

It's not a script, he's demonstrating health and attack are searchable as 4bytes*1 during a fight.

If you want to make a script out of it, locate your attack, for instance, then, after highliting the value in Cheat Engine, hit CTRL-B to get into the memory viewer. Look a few bytes to the left of your value.
Let's say you have 100 attack, and it's a 4 byte value. It will look like this: 

64 00 00 00


So look around the value to the left or the right. You'll probably notice a pattern. Make note of what you see. It might look like this.

66 11 12 00 00 01 00 00 64 00 00 00

I just made this up, don't search for it.

Do another battle, search for attack in the same way. Find the value, CTRL-B to get into the Memory Viewer, look for the same pattern to the left of your attack.

Once you see what the pattern of bytes looks like before your health, you can make a script for it.

Step 1, find the byte pattern. Let's say it's the same as I invented above. To search for "whatever your attack is" you would search thusly:

66 11 12 00 00 01 00 00 ?? ?? ?? 00
  ^^the pattern you saw^^  ^^^ your health

This is just an idea, go do it and find out what's before your attack. When do it for health.

Here's an example of how a simple script would work: 
 
[ENABLE]
Aobscan(_SuperMode,?? ?? ?? a0 b2 a1 ff 01 ?? ?? ?? ??)
_SuperMode :
db 09 09 09 a0 b2 a1 ff 01 65 54 43 32
[DISABLE] 
 
The blue string is the one you've discovered and want to change. The green string is the value you want to change it to.

You might change your attack value to a higher number, and activate it during a battle.
 
I recommended reading Section 5 of : http://forum.cheatengine.org/viewtopic.php?t=570083  .
 
To use a script you made, in Cheat Engine hit CTRL-M to get into the Memory Viewer, then CTRL-A to get into the Auto Assembler. Paste in your code, and then File-Assign to current cheat something.