Looking for help with setting up a trading bot that buys/sells every time a large purchase happens on a certain coin

Hey, so first of all, I am practically completely new to the cryptosphere and have soooo much to learn and understand, so please bare with me.

Lately, I've been monitoring the trading activity of this coin I really like, and I noticed today a pattern with larger buys and sells. Every time a random wallet makes a purchase of say, $1000 or higher, another particular wallet address manages to buy at the exact same time, but then also immediately sells, making a small profit. It only seems to buy like $260 but then sells for $272 and makes a $12 profit. But it's doing it constantly, which is allowing it to grow those small gains all day long. Not only that, but everytime someone sells more than $1000 it also auto sells with them before the price tanks, and then rebuys at the dip. I tried to find a pattern with the addresses that are doing the larger buys/sells, but there doesn't seem to be any consistency in the "bot" address and the address making the large buys/sells.

Now, I don't know if this is frowned upon, or wrong, or what, but assuming all is fair in the trading bot realm, how does one achieve this kind of scenario??